Small change to make init of vars buildable in clang and clang++ (#1590)

core/iwasm/libraries/lib-socket/src/wasi/wasi_socket_ext.c

@@ -90,9 +90,11 @@ wasi_addr_to_sockaddr(const __wasi_addr_t *wasi_addr,
     switch (wasi_addr->kind) {
         case IPv4:
         {
-            struct sockaddr_in sock_addr_in = { 0 };
+            struct sockaddr_in sock_addr_in;
             uint32_t s_addr;
 
+            memset(&sock_addr_in, 0, sizeof(sockaddr_in));
+            
             s_addr = (wasi_addr->addr.ip4.addr.n0 << 24)
                      | (wasi_addr->addr.ip4.addr.n1 << 16)
                      | (wasi_addr->addr.ip4.addr.n2 << 8)
@@ -108,7 +110,10 @@ wasi_addr_to_sockaddr(const __wasi_addr_t *wasi_addr,
         }
         case IPv6:
         {
-            struct sockaddr_in6 sock_addr_in6 = { 0 };
+            struct sockaddr_in6 sock_addr_in6;
+            
+            memset(&sock_addr_in6, 0, sizeof(sockaddr_in6));
+
             uint16_t *addr_buf = (uint16_t *)sock_addr_in6.sin6_addr.s6_addr;
 
             addr_buf[0] = htons(wasi_addr->addr.ip6.addr.n0);