mesa: Pass the correct caller string to _mesa_lookup_or_create_texture

An actual bug found by the 'unused parameter' warning. :D

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7167>
1 file changed