glamor: zero num_formats from the start
The caller may ignore the return value (will be addressed with later commit) so simply zero the count from the get-go. We're pretty much do so, in all cases but one :-\ Fixes: cef12efc ("glamor: Implement GetSupportedModifiers") Cc: Louis-Francis Ratté-Boulianne <lfrb@collabora.com> Cc: Daniel Stone <daniels@collabora.com> Reviewed-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
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