Remove confusing use of IS_9XX

... and test for what we mean instead.

Reported-by: Diego Celix <dcelix@gmail.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/tools/intel_error_decode.c b/tools/intel_error_decode.c
index a27ade9..2745019 100644
--- a/tools/intel_error_decode.c
+++ b/tools/intel_error_decode.c
@@ -202,7 +202,7 @@
 {
 	if (IS_965(devid)) {
 		return print_i965_pgtbl_err(reg);
-	} else if (IS_9XX(devid)) {
+	} else if (IS_GEN3(devid)) {
 		return print_i915_pgtbl_err(reg);
 	} else {
 		return print_i830_pgtbl_err(reg);
@@ -268,7 +268,7 @@
 		    devid = reg;
 		    if (IS_965(devid)) {
 			    printf("Detected i965+ chipset\n");
-		    } else if (IS_9XX(devid)) {
+		    } else if (IS_GEN3(devid)) {
 			    printf("Detected i9xx chipset\n");
 		    } else {
 			    printf("Detected i8xx chipset\n");