mdadm: define DEV_MD_DIR

It is used many times. Additionally define _LEN to avoid repeated
strlen() calls when length is needed.

Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
Signed-off-by: Jes Sorensen <jes@trained-monkey.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/sysfs.c b/sysfs.c
index ca1d888f..94d02f53 100644
--- a/sysfs.c
+++ b/sysfs.c
@@ -1114,7 +1114,7 @@ void sysfsline(char *line)
 		if (strncasecmp(w, "name=", 5) == 0) {
 			char *devname = w + 5;
 
-			if (strncmp(devname, "/dev/md/", 8) == 0) {
+			if (strncmp(devname, DEV_MD_DIR, DEV_MD_DIR_LEN) == 0) {
 				if (sr->devname)
 					pr_err("Only give one device per SYSFS line: %s\n",
 						devname);