[RFC PATCHv2 2/2] am: avoid re-directing stdin twice

[Chris Packham <judge.packham@gmail.com>]

In check_patch_format we feed $1 to a block that attempts to determine
the patch format. Since we've already redirected $1 to stdin there is no
need to redirect it again when we invoke tr. This prevents the following
errors when invoking git am

  $ git am patch.patch
  tr: write error: Broken pipe
  tr: write error
  Patch format detection failed.

Cc: Stephen Boyd <bebarino@gmail.com>
Signed-off-by: Chris Packham <judge.packham@gmail.com>
---
 git-am.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/git-am.sh b/git-am.sh
index f979925..5d69c89 100755
--- a/git-am.sh
+++ b/git-am.sh
@@ -253,7 +253,7 @@ check_patch_format () {
 			# discarding the indented remainder of folded lines,
 			# and see if it looks like that they all begin with the
 			# header field names...
-			tr -d '\015' <"$1" |
+			tr -d '\015' |
 			sed -n -e '/^$/q' -e '/^[ 	]/d' -e p |
 			sane_egrep -v '^[!-9;-~]+:' >/dev/null ||
 			patch_format=mbox
-- 
2.0.4.2.gadd452d