avoid "write_in_full(fd, buf, len) != len" pattern

diff --git a/sha1_name.c b/sha1_name.c
index e7f7b12cebfb4060a5d3e6567029bb308c16f61f..74fcb6d788f4cb591a9f7d3c6a2692f5c6d84022 100644 (file)
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -489,10 +489,9 @@ int find_unique_abbrev_r(char *hex, const unsigned char *sha1, int len)
                 * We now know we have on the order of 2^len objects, which
                 * expects a collision at 2^(len/2). But we also care about hex
                 * chars, not bits, and there are 4 bits per hex. So all
-                * together we need to divide by 2; but we also want to round
-                * odd numbers up, hence adding one before dividing.
+                * together we need to divide by 2 and round up.
                 */
-               len = (len + 1) / 2;
+               len = DIV_ROUND_UP(len, 2);
                /*
                 * For very small repos, we stick with our regular fallback.
                 */