Fix .gitignore for ralloc-test

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
diff --git a/src/glsl/tests/.gitignore b/src/glsl/tests/.gitignore
index 654d8a5..f773377 100644
--- a/src/glsl/tests/.gitignore
+++ b/src/glsl/tests/.gitignore
@@ -1,3 +1,3 @@
 Makefile
-ralloc_test
+ralloc-test
 uniform-initializer-test