libsysutils: Fix vold vulnerability in FrameworkListener

Don't release the sender socket when FrameworkListener receives
a command that exceed the maximum buffer length

Bug: https://issuetracker.google.com/issues/62812018
Test: manual

Change-Id: I160f504f3fb902ba25fc79deb8ae7d78d811a807

libsysutils/src/FrameworkListener.cpp

@@ -68,7 +68,7 @@ bool FrameworkListener::onDataAvailable(SocketClient *c) {
         android_errorWriteLog(0x534e4554, "29831647");
         c->sendMsg(500, "Command too large for buffer", false);
         mSkipToNextNullByte = true;
-        return false;
+        return true;
     }
 
     int offset = 0;