arb_multisample: Fix bitwise-instead-of-logical warning
tests/spec/arb_multisample/pushpop.c:144:9: warning: use of bitwise '&' with boolean operands [-Wbitwise-instead-of-logical]
144 | return test_enable_bits(enable_on) & test_coverage(coverage_mode);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| &&
tests/spec/arb_multisample/pushpop.c:144:9: note: cast one or both operands to int to silence this warning
Fixes: 1f58a74ca ("ARB_multisample/pushpop: New test for PushAttrib/PopAttrib.")
Signed-off-by: Vinson Lee <vlee@freedesktop.org>