curgitb : remove parenthesis

Useful/curgitb

@@ -3,5 +3,8 @@ current_branch=`git branch 2>&1`
 if [ "$current_branch" != 'fatal: not a git repository (or any of the parent directories): .git' ]
 then
 	current_branch=`echo "$current_branch" | grep \* | cut -d ' ' -f2`
-	echo "($current_branch)"
-fi
+	echo "$current_branch"
+	exit 0
+else
+	exit 1
+fi