[Bug 288164] Crash at selection of Call Graph tab

[Josef Weidendorfer]

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

--- Comment #12 from Josef Weidendorfer <josef.weidendorfer at gmx.de> ---
Created attachment 69337
  --> https://bugs.kde.org/attachment.cgi?id=69337&action=edit
Alternative fix

Simpler patch. No need to check if process could be started.
If not, anything written to its stdin will be discarded anyway.

However, the real problem is that _renderProcess could be set
to 0 (in dotError(), on detection that process could not be started),
and afterwards used in "_renderProcess->closeWriteChannel()".
It should be enough to have a local "renderProcess" variable that
can not be set to 0 from the outside.

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