net/socket: psock_send/psock_sendto: remove assert check for null psock and...

net/socket: psock_send/psock_sendto: remove assert check for null psock and buf input pointers.  Removes check as 'psock == NULL' altogether because that checked for later in psock_send and psock_sendto. Change null check for 'buf' so that it is handled same as in recvfrom.c (return -EINVAL instead of
assert).

net/socket/send.c

@@ -89,7 +89,14 @@ ssize_t psock_send(FAR struct socket *psock, FAR const void *buf, size_t len,
 {
   ssize_t ret;
 
-  DEBUGASSERT(psock != NULL && buf != NULL);
+  /* Verify that non-NULL pointers were passed */
+
+#ifdef CONFIG_DEBUG_FEATURES
+  if (buf == NULL)
+    {
+      return -EINVAL;
+    }
+#endif
 
   /* Verify that the sockfd corresponds to valid, allocated socket */
 

net/socket/sendto.c

@@ -124,7 +124,14 @@ ssize_t psock_sendto(FAR struct socket *psock, FAR const void *buf,
 {
   ssize_t nsent;
 
-  DEBUGASSERT(psock != NULL && buf != NULL);
+  /* Verify that non-NULL pointers were passed */
+
+#ifdef CONFIG_DEBUG_FEATURES
+  if (buf == NULL)
+    {
+      return -EINVAL;
+    }
+#endif
 
   /* If to is NULL or tolen is zero, then this function is same as send (for
    * connected socket types)