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gthread: fix minor errno problem in GCond

Philip Withnall requested to merge pwithnall/glib:backport-958-gcond-errno-glib-2-60 into glib-2-60

The return value from g_cond_wait_until() is calculated, based on the value of errno after reacquiring the mutex. This is a problem because errno can be overwritten in the case the mutex is contended (in which case the slow-path code will re-enter the kernel).

Perform the calculation before reacquiring the mutex.

See merge request !958 (merged)

Trivial backport of !958 (merged) to glib-2-60.

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