intel/brw/xe2+: Only apply Wa 22016140776 to math instructions

The check in has_invalid_src_region incorrectly omitted inst->is_math()
from the condition.

Fixes: 0e817ba548 ("intel/brw/xe2+: Implement Wa 22016140776")
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28821>

src/intel/compiler/brw_fs_lower_regioning.cpp

@@ -244,7 +244,7 @@ namespace {
        *    Compiler must use a mov instruction to expand the scalar value to
        *    a vector before using in a HF (packed or unpacked) math operation.
        */
-      if (intel_needs_workaround(devinfo, 22016140776) &&
+      if (inst->is_math() && intel_needs_workaround(devinfo, 22016140776) &&
           is_uniform(inst->src[i]) && inst->src[i].type == BRW_REGISTER_TYPE_HF) {
          return true;
       }