This fixes the following assertion when the key is 0.
main/hash.c:181: _mesa_HashLookup_unlocked: Assertion `key' failed.
Fixes: 633c959fae ("getteximage: Return correct error value when texure object is not found")
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>