[PATCH] Make gitk work when launched in a subdirectory

Make gitk use git-rev-parse --git-dir to find the repository.

Signed-off-by: Peter Baumann <siprbaum@stud.informatik.uni-erlangen.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/gitk b/gitk
index 33bac1f..031c829 100755
--- a/gitk
+++ b/gitk
@@ -12,7 +12,7 @@
     if {[info exists env(GIT_DIR)]} {
 	return $env(GIT_DIR)
     } else {
-	return ".git"
+	return [exec git rev-parse --git-dir]
     }
 }