common: Fix a compiler warning
gsd-input-helper.c: In function ‘trackball_is_present’: gsd-input-helper.c:256:18: warning: ‘retval’ may be used uninitialized in this function [-Wmaybe-uninitialized] https://bugzilla.gnome.org/show_bug.cgi?id=756859
parent
af8a40c2
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