src/core: Fix speling issues

Found by codespell

codespell_check.sh

@@ -41,6 +41,7 @@ CODESPELL_OPTS+=" --check-hidden"
 # "ofo => of", "WAN => WANT", "mut => must, mutt, moot"
 CODESPELL_OPTS+=" --ignore-words-list=nd,ans,tolen,ofo,wan,mut,clen,useg,clos "
 CODESPELL_OPTS+=" --ignore-words-list=devine,clinet,linz,garantie,explicite,numer "
+CODESPELL_OPTS+=" --ignore-words-list=skool "
 # propagate all options to codespell -> pass "-w" to this script to write changes
 CODESPELL_OPTS+="$@"
 

src/core/ipv4/acd.c

@@ -143,7 +143,7 @@ acd_add(struct netif *netif, struct acd *acd,
 
 /**
  * @ingroup acd
- * Remvoe ACD client from the client list
+ * Remove ACD client from the client list
  *
  * @param netif network interface from which to remove the acd client
  * @param acd   acd module to be removed from the list

src/core/ipv6/nd6.c

@@ -1176,7 +1176,7 @@ nd6_tmr(void)
 
 /** Send a neighbor solicitation message for a specific neighbor cache entry
  *
- * @param entry the neightbor cache entry for which to send the message
+ * @param entry the neighbor cache entry for which to send the message
  * @param flags one of ND6_SEND_FLAG_*
  */
 static void
@@ -1707,7 +1707,7 @@ nd6_select_router(const ip6_addr_t *ip6addr, struct netif *netif)
   /* Look for valid routers. A reachable router is preferred. */
   valid_router = -1;
   for (i = 0; i < LWIP_ND6_NUM_ROUTERS; i++) {
-    /* Is the router netif both set and apppropriate? */
+    /* Is the router netif both set and appropriate? */
     if (default_router_list[i].neighbor_entry != NULL) {
       router_netif = default_router_list[i].neighbor_entry->netif;
       if ((router_netif != NULL) && (netif != NULL ? netif == router_netif :

src/core/mem.c

@@ -792,7 +792,7 @@ mem_trim(void *rmem, mem_size_t new_size)
   /* else {
     next struct mem is used but size between mem and mem2 is not big enough
     to create another struct mem
-    -> don't do anyhting.
+    -> don't do anything.
     -> the remaining space stays unused since it is too small
   } */
 #if MEM_OVERFLOW_CHECK

src/core/netif.c

@@ -1409,7 +1409,7 @@ netif_ip6_addr_set_parts(struct netif *netif, s8_t addr_idx, u32_t i0, u32_t i1,
     if (ip6_addr_isvalid(netif_ip6_addr_state(netif, addr_idx))) {
       netif_do_ip_addr_changed(netif_ip_addr6(netif, addr_idx), &new_ipaddr);
     }
-    /* @todo: remove/readd mib2 ip6 entries? */
+    /* @todo: remove/re-add mib2 ip6 entries? */
 
     ip_addr_copy(netif->ip6_addr[addr_idx], new_ipaddr);
 

src/core/tcp_in.c

@@ -1564,7 +1564,7 @@ tcp_receive(struct tcp_pcb *pcb)
           recv_data = inseg.p;
           /* Since this pbuf now is the responsibility of the
              application, we delete our reference to it so that we won't
-             (mistakingly) deallocate it. */
+             (mistakenly) deallocate it. */
           inseg.p = NULL;
         }
         if (TCPH_FLAGS(inseg.tcphdr) & TCP_FIN) {

src/core/tcp_out.c

@@ -301,7 +301,7 @@ tcp_seg_add_chksum(u16_t chksum, u16_t len, u16_t *seg_chksum,
 /** Checks if tcp_write is allowed or not (checks state, snd_buf and snd_queuelen).
  *
  * @param pcb the tcp pcb to check for
- * @param len length of data to send (checked agains snd_buf)
+ * @param len length of data to send (checked against snd_buf)
  * @return ERR_OK if tcp_write is allowed to proceed, another err_t otherwise
  */
 static err_t

src/core/udp.c

@@ -988,7 +988,7 @@ udp_bind(struct udp_pcb *pcb, const ip_addr_t *ipaddr, u16_t port)
     for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
       if (pcb != ipcb) {
         /* By default, we don't allow to bind to a port that any other udp
-           PCB is already bound to, unless *all* PCBs with that port have tha
+           PCB is already bound to, unless *all* PCBs with that port have the
            REUSEADDR flag set. */
 #if SO_REUSE
         if (!ip_get_option(pcb, SOF_REUSEADDR) ||

src/include/lwip/arch.h

@@ -382,7 +382,7 @@ extern "C" {
 #define LWIP_PROVIDE_ERRNO
 #endif
 
-/* Use a special, reproducable version of rand() for fuzz tests? */
+/* Use a special, reproducible version of rand() for fuzz tests? */
 #ifdef LWIP_RAND_FOR_FUZZ
 #ifdef LWIP_RAND
 #undef LWIP_RAND

src/include/lwip/snmp.h

@@ -1,6 +1,6 @@
 /**
  * @file
- * SNMP support API for implementing netifs and statitics for MIB2
+ * SNMP support API for implementing netifs and statistics for MIB2
  */
 
 /*