net/usrsock: fix get/setsockopt issue about usrsock protocol

Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>

net/usrsock/usrsock_getsockopt.c

@@ -189,7 +189,7 @@ int usrsock_getsockopt(FAR struct socket *psock, int level, int option,
           *value_len = sizeof(int);
           return OK;
         }
-      else
+      else if (option == SO_RCVTIMEO || option == SO_SNDTIMEO)
         {
           return -ENOPROTOOPT;
         }

net/usrsock/usrsock_setsockopt.c

@@ -174,10 +174,6 @@ int usrsock_setsockopt(FAR struct socket *psock, int level, int option,
         {
           return -ENOPROTOOPT;
         }
-      else
-        {
-          return -EINVAL;
-        }
     }
 
   net_lock();