intel/compiler: Cast reg types explicitly

Makes coverity happier.

CID: 1416799
Fixes: c1ac1a3d25 (i965: Add a brw_hw_type_to_reg_type() function)

Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
diff --git a/src/intel/compiler/brw_reg_type.c b/src/intel/compiler/brw_reg_type.c
index a0f674f..98c4cf7 100644
--- a/src/intel/compiler/brw_reg_type.c
+++ b/src/intel/compiler/brw_reg_type.c
@@ -111,13 +111,13 @@
 {
    if (file == BRW_IMMEDIATE_VALUE) {
       for (enum brw_reg_type i = 0; i <= BRW_REGISTER_TYPE_LAST; i++) {
-         if (gen4_hw_type[i].imm_type == hw_type) {
+         if (gen4_hw_type[i].imm_type == (enum hw_imm_type)hw_type) {
             return i;
          }
       }
    } else {
       for (enum brw_reg_type i = 0; i <= BRW_REGISTER_TYPE_LAST; i++) {
-         if (gen4_hw_type[i].reg_type == hw_type) {
+         if (gen4_hw_type[i].reg_type == (enum hw_reg_type)hw_type) {
             return i;
          }
       }