Suppress "'noreturn' function does return" warnings

up_pthread_start and up_task_start.

arch/arm/src/common/up_pthread_start.c

@@ -80,6 +80,8 @@ void up_pthread_start(pthread_startroutine_t entrypt, pthread_addr_t arg)
   /* Let sys_call2() do all of the work */
 
   sys_call2(SYS_pthread_start, (uintptr_t)entrypt, (uintptr_t)arg);
+
+  PANIC();
 }
 
 #endif /* (CONFIG_BUILD_PROTECTED || CONFIG_BUILD_KERNEL) && !CONFIG_DISABLE_PTHREAD */

arch/arm/src/common/up_task_start.c

@@ -80,6 +80,8 @@ void up_task_start(main_t taskentry, int argc, FAR char *argv[])
 
   sys_call3(SYS_task_start, (uintptr_t)taskentry, (uintptr_t)argc,
             (uintptr_t)argv);
+
+  PANIC();
 }
 
 #endif /* CONFIG_BUILD_PROTECTED || CONFIG_BUILD_KERNEL */

arch/or1k/src/common/up_pthread_start.c

@@ -82,6 +82,8 @@ void up_pthread_start(pthread_startroutine_t entrypt, pthread_addr_t arg)
   sinfo("entry %p arg %p\n", entrypt, arg);
 
   sys_call2(SYS_pthread_start, (uintptr_t)entrypt, (uintptr_t)arg);
+
+  PANIC();
 }
 
 #endif /* (CONFIG_BUILD_PROTECTED || CONFIG_BUILD_KERNEL) && !CONFIG_DISABLE_PTHREAD */

arch/or1k/src/common/up_task_start.c

@@ -82,6 +82,8 @@ void up_task_start(main_t taskentry, int argc, FAR char *argv[])
 
   sys_call3(SYS_task_start, (uintptr_t)taskentry, (uintptr_t)argc,
             (uintptr_t)argv);
+
+  PANIC();
 }
 
 #endif /* CONFIG_BUILD_PROTECTED || CONFIG_BUILD_KERNEL */

arch/risc-v/src/common/up_pthread_start.c

@@ -65,6 +65,8 @@ void up_pthread_start(pthread_startroutine_t entrypt, pthread_addr_t arg)
   /* Let sys_call2() do all of the work */
 
   sys_call2(SYS_pthread_start, (uintptr_t)entrypt, (uintptr_t)arg);
+
+  PANIC();
 }
 
 #endif /* (CONFIG_BUILD_PROTECTED || CONFIG_BUILD_KERNEL) && !CONFIG_DISABLE_PTHREAD */

arch/risc-v/src/common/up_task_start.c

@@ -65,6 +65,8 @@ void up_task_start(main_t taskentry, int argc, FAR char *argv[])
 
   sys_call3(SYS_task_start, (uintptr_t)taskentry, (uintptr_t)argc,
             (uintptr_t)argv);
+
+  PANIC();
 }
 
 #endif /* CONFIG_BUILD_PROTECTED || CONFIG_BUILD_KERNEL */