[PATCH 8/7] mergetool--lib: don't call "exit" in setup_tool

[John Keeping <john@keeping.me.uk>]

This will make it easier to use setup_tool in places where we expect
that the selected tool will not support the current mode.

Signed-off-by: John Keeping <john@keeping.me.uk>
---
 git-mergetool--lib.sh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/git-mergetool--lib.sh b/git-mergetool--lib.sh
index 4c1e129..c6bd8ba 100644
--- a/git-mergetool--lib.sh
+++ b/git-mergetool--lib.sh
@@ -67,11 +67,11 @@ setup_tool () {
 	if merge_mode && ! can_merge
 	then
 		echo "error: '$tool' can not be used to resolve merges" >&2
-		exit 1
+		return 1
 	elif diff_mode && ! can_diff
 	then
 		echo "error: '$tool' can only be used to resolve merges" >&2
-		exit 1
+		return 1
 	fi
 	return 0
 }
@@ -100,7 +100,7 @@ run_merge_tool () {
 	status=0
 
 	# Bring tool-specific functions into scope
-	setup_tool "$1"
+	setup_tool "$1" || return
 
 	if merge_mode
 	then
-- 
1.8.1