Merge branch 'rs/find-pack-entry-bisection' into maint

Code clean-up.

* rs/find-pack-entry-bisection:
  sha1_file: avoid comparison if no packed hash matches the first byte

sha1_file.c

@@ -2800,7 +2800,7 @@ off_t find_pack_entry_one(const unsigned char *sha1,
 		return nth_packed_object_offset(p, pos);
 	}
 
-	do {
+	while (lo < hi) {
 		unsigned mi = (lo + hi) / 2;
 		int cmp = hashcmp(index + mi * stride, sha1);
 
@@ -2813,7 +2813,7 @@ off_t find_pack_entry_one(const unsigned char *sha1,
 			hi = mi;
 		else
 			lo = mi+1;
-	} while (lo < hi);
+	}
 	return 0;
 }