[PATCH] am: format is in $patch_format, not parse_patch

The error message given when the patch format was not recognized was
wrong, since the variable checked was $parse_patch rather than
$patch_format. Fix by checking the non-emptyness of the correct
variable.

Signed-off-by: Giuseppe Bilotta <redacted>
---
 git-am.sh |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/git-am.sh b/git-am.sh
index e78cb54..4fff195 100755
--- a/git-am.sh
+++ b/git-am.sh

@@ -312,7 +312,7 @@ split_patches ()
 		msgnum=
 		;;
 	*)
-		if test -n "$parse_patch" ; then
+		if test -n "$patch_format" ; then
 			clean_abort "$(eval_gettext "Patch format \$patch_format is not supported.")"
 		else
 			clean_abort "$(gettext "Patch format detection failed.")"

-- 
1.7.7.rc0.328.g626f7.dirty