Fix ref log parsing so it works properly.

The log parser was only ever matching the last log record due to
calling strtoul on "> 1136091609" rather than " 1136091609".  Also
once a match for '@' has been found after the name of the ref there
is no point in looking for another '@' within the remaining text.

Signed-off-by: Junio C Hamano <junkio@cox.net>

refs.c

@@ -459,7 +459,7 @@ int read_ref_at(const char *ref, unsigned long at_time, unsigned char *sha1)
 			c++;
 		if (c == logend || *c == '\n')
 			die("Log %s is corrupt.", logfile);
-		date = strtoul(c, NULL, 10);
+		date = strtoul(c + 1, NULL, 10);
 		if (date <= at_time) {
 			if (get_sha1_hex(rec + 41, sha1))
 				die("Log %s is corrupt.", logfile);

sha1_name.c

@@ -267,6 +267,7 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
 			at_time = approxidate(date_spec);
 			free(date_spec);
 			len = at_mark;
+			break;
 		}
 	}