Merge "Fix behavior where the non-blocking sendToCliend would block when there was enough room for the message but not the message header."

libs/rs/rsContext.cpp

@@ -798,7 +798,7 @@ bool Context::sendMessageToClient(void *data, uint32_t cmdID, size_t len, bool w
         return false;
     }
     if (!waitForSpace) {
-        if (mIO.mToClient.getFreeSpace() < len) {
+        if (mIO.mToClient.getFreeSpace() <= (len + 8)) {
             // Not enough room, and not waiting.
             return false;
         }