Ryan Lortie dbf95a5ae9 measure_disk_usage: skip progress on NULL callback
In the real_..._async wrapper for GFile.measure_disk_usage, skip the
wrapping of the progress callback in the case that the user gave a NULL
callback to the async function.  This is a performance improvement
because the sync version won't have to do continuous sampling of the
clock to issue a call to the wrapper which will then do nothing.

Unfortunately, I made this simplifying assumption when writing the
wrapper, but forgot to actually implement it when making the sync call.
As a result, the wrapper is still called, and invokes the NULL callback,
causing a segfault.

Make sure we pass NULL if the user's callback was NULL.

https://bugzilla.gnome.org/show_bug.cgi?id=707787
2013-09-17 09:44:23 -04:00
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