pthread: Return get_errno instead the hardcode value

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: I1830a473da179d3a1280d3482b0f000ce72de107

libs/libc/pthread/pthread_barrierwait.c

@@ -113,7 +113,7 @@ int pthread_barrier_wait(FAR pthread_barrier_t *barrier)
   if (ret != OK)
     {
       sched_unlock();
-      return EINVAL;
+      return get_errno();
     }
 
   /* If the number of waiters would be equal to the count, then we are done */

libs/libc/pthread/pthread_conddestroy.c

@@ -95,7 +95,7 @@ int pthread_cond_destroy(FAR pthread_cond_t *cond)
             }
           else if (sem_destroy(&cond->sem) != OK)
             {
-              ret = EINVAL;
+              ret = get_errno();
             }
         }
     }

libs/libc/pthread/pthread_condinit.c

@@ -80,9 +80,9 @@ int pthread_cond_init(FAR pthread_cond_t *cond,
    * initial count = 0
    */
 
-  else if (sem_init((FAR sem_t *)&cond->sem, 0, 0) != OK)
+  else if (sem_init(&cond->sem, 0, 0) != OK)
     {
-      ret = EINVAL;
+      ret = get_errno();
     }
   else
     {