Fix error: ‘access’ may be used uninitialized in this function
 [-Werror=maybe-uninitialized]
in GrGLGpu::bindImageStorage.

Found because this broke the compiles for the debugger, imageinfo, and fiddle, 
but apparently not any bots?

BUG=skia:

Change-Id: Id8f964bca4f6493428b35c1b64df468b9d1419db
Reviewed-on: https://skia-review.googlesource.com/5380
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Joe Gregorio <jcgregorio@google.com>
1 file changed