Fix return value not checked issue reported by Coverity (#1156)

Fix return value not checked issue in function init_wasm_timer,
reported by Coverity

core/app-framework/base/native/runtime_lib.h

@@ -8,7 +8,7 @@
 
 #include "runtime_timer.h"
 
-void
+bool
 init_wasm_timer();
 void
 exit_wasm_timer();

core/app-framework/base/native/timer_wrapper.c

@@ -83,19 +83,36 @@ wakeup_modules_timer_thread(timer_ctx_t ctx)
     os_mutex_unlock(&g_timer_ctx_list_mutex);
 }
 
-void
+bool
 init_wasm_timer()
 {
     korp_tid tm_tid;
     bh_list_init(&g_timer_ctx_list);
 
-    os_cond_init(&g_timer_ctx_list_cond);
+    if (os_cond_init(&g_timer_ctx_list_cond) != 0) {
+        return false;
+    }
     /* temp solution for: thread_modulers_timer_check thread
        would recursive lock the mutex */
-    os_recursive_mutex_init(&g_timer_ctx_list_mutex);
+    if (os_recursive_mutex_init(&g_timer_ctx_list_mutex) != 0) {
+        goto fail1;
+    }
+
+    if (0
+        != os_thread_create(&tm_tid, thread_modulers_timer_check, NULL,
+                            BH_APPLET_PRESERVED_STACK_SIZE)) {
+        goto fail2;
+    }
+
+    return true;
+
+fail2:
+    os_mutex_destroy(&g_timer_ctx_list_mutex);
+
+fail1:
+    os_cond_destroy(&g_timer_ctx_list_cond);
 
-    os_thread_create(&tm_tid, thread_modulers_timer_check, NULL,
-                     BH_APPLET_PRESERVED_STACK_SIZE);
+    return false;
 }
 
 void

samples/gui/wasm-runtime-wgl/src/platform/linux/iwasm_main.c

@@ -531,8 +531,10 @@ iwasm_main(int argc, char *argv[])
         goto fail2;
     }
 
-    // timer manager
-    init_wasm_timer();
+    /* timer manager */
+    if (!init_wasm_timer()) {
+        goto fail3;
+    }
 
 #ifndef CONNECTION_UART
     if (server_mode)
@@ -548,6 +550,8 @@ iwasm_main(int argc, char *argv[])
     app_manager_startup(&interface);
 
     exit_wasm_timer();
+
+fail3:
     exit_sensor_framework();
 
 fail2:

samples/gui/wasm-runtime-wgl/src/platform/zephyr/iwasm_main.c

@@ -177,12 +177,14 @@ iwasm_main()
     wgl_init();
     hal_init();
 
-    // timer manager
-    init_wasm_timer();
+    /* timer manager */
+    if (!init_wasm_timer()) {
+        goto fail;
+    }
 
-    // TODO:
     app_manager_startup(&interface);
 
+fail:
     wasm_runtime_destroy();
     return -1;
 }

samples/littlevgl/vgl-wasm-runtime/src/platform/linux/iwasm_main.c

@@ -511,8 +511,10 @@ iwasm_main(int argc, char *argv[])
         goto fail2;
     }
 
-    // timer manager
-    init_wasm_timer();
+    /* timer manager */
+    if (!init_wasm_timer()) {
+        goto fail3;
+    }
 
 #ifndef CONNECTION_UART
     if (server_mode)
@@ -528,6 +530,8 @@ iwasm_main(int argc, char *argv[])
     app_manager_startup(&interface);
 
     exit_wasm_timer();
+
+fail3:
     exit_sensor_framework();
 
 fail2:

samples/littlevgl/vgl-wasm-runtime/src/platform/zephyr/iwasm_main.c

@@ -118,12 +118,14 @@ iwasm_main()
 
     display_init();
 
-    // timer manager
-    init_wasm_timer();
+    /* timer manager */
+    if (!init_wasm_timer()) {
+        goto fail;
+    }
 
-    // TODO:
     app_manager_startup(&interface);
 
+fail:
     wasm_runtime_destroy();
     return -1;
 }

samples/simple/src/iwasm_main.c

@@ -518,9 +518,6 @@ iwasm_main(int argc, char *argv[])
         return -1;
     }
 
-    /* timer manager */
-    init_wasm_timer();
-
     /* connection framework */
     if (!init_connection_framework()) {
         goto fail1;
@@ -531,6 +528,11 @@ iwasm_main(int argc, char *argv[])
         goto fail2;
     }
 
+    /* timer manager */
+    if (!init_wasm_timer()) {
+        goto fail3;
+    }
+
     /* add the sys sensor objects */
     add_sys_sensor("sensor_test1", "This is a sensor for test", 0, 1000,
                    read_test_sensor, config_test_sensor);
@@ -552,6 +554,8 @@ iwasm_main(int argc, char *argv[])
     app_manager_startup(&interface);
 
     exit_wasm_timer();
+
+fail3:
     exit_sensor_framework();
 
 fail2: