cris: avoid "naked" qemu_log

Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/target-cris/translate.c b/target-cris/translate.c
index 354c86d..2429931 100644
--- a/target-cris/translate.c
+++ b/target-cris/translate.c
@@ -779,7 +779,7 @@
         t_gen_subx_carry(dc, dst);
         break;
     default:
-        qemu_log("illegal ALU op.\n");
+        qemu_log_mask(LOG_GUEST_ERROR, "illegal ALU op.\n");
         BUG();
         break;
     }