[PATCH v2 1/6] match_pathname: avoid calling strncmp if baselen is 0

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

This reduces "git status" user time by a little bit. This is the
sorted results of 10 consecutive runs of "git ls-files
--exclude-standard -o" on webkit.git, compiled with gcc -O2:

        before      after
user    0m0.607s    0m0.554s
user    0m0.613s    0m0.564s
user    0m0.613s    0m0.571s
user    0m0.621s    0m0.576s
user    0m0.621s    0m0.578s
user    0m0.622s    0m0.579s
user    0m0.624s    0m0.583s
user    0m0.626s    0m0.584s
user    0m0.628s    0m0.586s
user    0m0.638s    0m0.592s

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 dir.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/dir.c b/dir.c
index 57394e4..b3cd66c 100644
--- a/dir.c
+++ b/dir.c
@@ -662,8 +662,8 @@ int match_pathname(const char *pathname, int pathlen,
 	 * may not end with a trailing slash though.
 	 */
 	if (pathlen < baselen + 1 ||
-	    (baselen && pathname[baselen] != '/') ||
-	    strncmp_icase(pathname, base, baselen))
+	    (baselen && (pathname[baselen] != '/' ||
+			 strncmp_icase(pathname, base, baselen))))
 		return 0;
 
 	namelen = baselen ? pathlen - baselen - 1 : pathlen;
-- 
1.8.1.2.536.gf441e6d