[PATCH 1/3] 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    0m0.580s    0m0.546s
user    0m0.581s    0m0.549s
user    0m0.582s    0m0.550s
user    0m0.584s    0m0.558s
user    0m0.586s    0m0.560s
user    0m0.587s    0m0.561s
user    0m0.587s    0m0.562s
user    0m0.593s    0m0.566s
user    0m0.597s    0m0.568s
user    0m0.601s    0m0.573s

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

diff --git a/dir.c b/dir.c
index 57394e4..669cf80 100644
--- a/dir.c
+++ b/dir.c
@@ -663,7 +663,7 @@ int match_pathname(const char *pathname, int pathlen,
 	 */
 	if (pathlen < baselen + 1 ||
 	    (baselen && pathname[baselen] != '/') ||
-	    strncmp_icase(pathname, base, baselen))
+	    (baselen && strncmp_icase(pathname, base, baselen)))
 		return 0;
 
 	namelen = baselen ? pathlen - baselen - 1 : pathlen;
-- 
1.8.1.2.536.gf441e6d