un-crash QPlainTestLogger::printMessage()

Commit cf4a6111150d866424ee07bda80a1d38f24ea02d refactored out test
identifier buildup into a standalone function, but it returned the
QTestCharBuffer as a value type, which ultimately caused it to crash:

Unfortunately QTestCharBuffer is not copied correctly: Since it uses the
default copy ctor it will copy the buf pointer and create a deep copy of
the staticBuf pointer. When the dtor was later called it would then end up
calling free(buf) (where buf pointed to the staticBuf of the original
QTestCharBuffer).

Task-number: QTBUG-66607
Change-Id: Ifa290658be6f077a0d6613451c26aeeffc8df41c
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
(cherry picked from commit 6ffb358822db2e0d30fb34853c3222cd866d57c5)
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

0 files changed, 0 insertions, 0 deletions