Lib.c: Fix geting devname for devices with long path

In scenario where VMD is enabled, and "x8" type of NVMe drive is
plugged into PCIe switch - the path will be longer than 200 chars
(additional VMD domain + 2 level of PCIe switches).
This patch makes the buffer big enough to handle this kind of
configurations.

Signed-off-by: Pawel Baldysiak <pawel.baldysiak@intel.com>
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>

lib.c

@@ -64,7 +64,7 @@ int get_mdp_major(void)
 char *devid2kname(int devid)
 {
 	char path[30];
-	char link[200];
+	char link[PATH_MAX];
 	static char devnm[32];
 	char *cp;
 	int n;