add function to partition.cpp to return max file size to mtp responder

Change-Id: If8114b5eac741db6c512fb35cb48e3825c2ff098

mtp/MtpServer.cpp

@@ -1078,8 +1078,10 @@ MtpResponseCode MtpServer::doSendObject() {
 		unlink(mSendObjectFilePath);
 		if (errno == ECANCELED)
 			result = MTP_RESPONSE_TRANSACTION_CANCELLED;
-		else
+		else {
+		    	MTPD("errno: %d\n", errno);
 			result = MTP_RESPONSE_GENERAL_ERROR;
+		}
 	}
 
 done:
@@ -1093,7 +1095,7 @@ done:
 	mSendObjectHandle = kInvalidObjectHandle;
 	MTPD("result: %d\n", result);
 	mSendObjectFormat = 0;
-	return MTP_RESPONSE_OK;
+	return result;
 }
 
 static void deleteRecursive(const char* path) {