QHttpMultipart: reset read pointer when device is reset

... otherwise we would not read from the beginning when trying to
read again. The device is reset when we try to resend a request
(e.g. remote host closed etc.).

(cherry picked from commit 795468bdc68931a90454bd1c975f7de7ba670e3b)

Change-Id: I8d7b3afb64b9cd25ee7c13b78f0b470d9dae3021
Reviewed-by: Shane Kearns <[email protected]>

Author: phartmann

src/network/access/qhttpmultipart.cpp

@@ -479,6 +479,7 @@ bool QHttpMultiPartIODevice::reset()
     for (int a = 0; a < multiPart->parts.count(); a++)
         if (!multiPart->parts[a].d->reset())
             return false;
+    readPointer = 0;
     return true;
 }
 qint64 QHttpMultiPartIODevice::readData(char *data, qint64 maxSize)