merge-one-file: fix "expr: non-numeric argument"

When invoking expr to compare two numbers, don't quote the
variables which are the output of 'wc -c'. On OS X, this output
includes spaces, which expr balks at:

  $ sz0=`wc -c </etc/passwd`
  $ sz1=`wc -c </etc/passwd`
  $ echo "'$sz0'"
  '    3667'

  $ expr "$sz0" \< "$sz1" \* 2
  expr: non-numeric argument

  $ expr $sz0 \< $sz1 \* 2
  1

Signed-off-by: Jay Soffian <jaysoffian@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-merge-one-file.sh

@@ -112,7 +112,7 @@ case "${1:-.}${2:-.}${3:-.}" in
 
 		# If we do not have enough common material, it is not
 		# worth trying two-file merge using common subsections.
-		expr "$sz0" \< "$sz1" \* 2 >/dev/null || : >$orig
+		expr $sz0 \< $sz1 \* 2 >/dev/null || : >$orig
 		;;
 	*)
 		echo "Auto-merging $4"