[Bug 288164] Crash at selection of Call Graph tab

[Josef Weidendorfer]

https://bugs.kde.org/show_bug.cgi?id=288164

--- Comment #13 from Josef Weidendorfer <josef.weidendorfer at gmx.de> ---
Can you check my fix? Your patch has the problem that perhaps the
process could be started, but another error appears, dotError() is
called, and "_renderProcess->closeWriteChannel();" still segfaults.

I am reluctant to use "waitForStarted()", as it can block the GUI.

But I just see that I have a memory leak, as the QProcess object is
not deleted when the process failed to start...

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