gem_gtt_hog: Print elapsed time in ms

Missed one last diff before pushing
diff --git a/tests/gem_gtt_hog.c b/tests/gem_gtt_hog.c
index 9a1f426..73c4e9e 100644
--- a/tests/gem_gtt_hog.c
+++ b/tests/gem_gtt_hog.c
@@ -170,8 +170,8 @@
 		igt_assert(status == 0);
 	}
 	gettimeofday(&end, NULL);
-	printf("Time to execute %lu children:		%7.3fµs\n",
-	       ARRAY_SIZE(children), elapsed(&start, &end));
+	printf("Time to execute %lu children:		%7.3fms\n",
+	       ARRAY_SIZE(children), elapsed(&start, &end) / 1000);
 
 	return 0;
 }