As sha1_file_name() could be performance sensitive, let's
make it faster by using strbuf_addstr() and strbuf_addc()
instead of strbuf_addf().

Helped-by: Derrick Stolee <sto...@gmail.com>
Helped-by: Jeff Hostetler <g...@jeffhostetler.com>
Signed-off-by: Christian Couder <chrisc...@tuxfamily.org>
---
 sha1_file.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

So compared to v2 I just removed the call to strbuf_grow()
and the related computation. 

diff --git a/sha1_file.c b/sha1_file.c
index f66c21b2da..4f7f17a24c 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -323,8 +323,8 @@ static void fill_sha1_path(struct strbuf *buf, const 
unsigned char *sha1)
 
 void sha1_file_name(struct strbuf *buf, const unsigned char *sha1)
 {
-       strbuf_addf(buf, "%s/", get_object_directory());
-
+       strbuf_addstr(buf, get_object_directory());
+       strbuf_addch(buf, '/');
        fill_sha1_path(buf, sha1);
 }
 
-- 
2.16.0.rc2.3.g7330290b09

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