libblkid: Fix blkid.conf parsing

The SEND_UEVENT=yes|no line is not properly parsed, because the offset
jumps one byte too far behind the equal sign. Therefore, every
configuration that contains the line "SEND_UEVENT=yes" still does not
send an uevent.

The fix is simple: adjust the offset to be "12" instead of "13".

libblkid/src/config.c

@@ -88,7 +88,7 @@ static int parse_next(FILE *fd, struct blkid_config *conf)
 	} while (*s == '\0' || *s == '#');
 
 	if (!strncmp(s, "SEND_UEVENT=", 12)) {
-		s += 13;
+		s += 12;
 		if (*s && !strcasecmp(s, "yes"))
 			conf->uevent = TRUE;
 		else if (*s)