staging: lustre: obdclass: compile issues with variable not being initialized

One of the versions of gcc I have refuses to build obd_mount.c due to
index not be initialized in function lmd_make_exclusion before it is
used.
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4629
Reviewed-on: http://review.whamcloud.com/10705Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/obdclass/obd_mount.c

@@ -730,7 +730,7 @@ int lustre_check_exclusion(struct super_block *sb, char *svname)
 static int lmd_make_exclusion(struct lustre_mount_data *lmd, const char *ptr)
 {
 	const char *s1 = ptr, *s2;
-	__u32 index, *exclude_list;
+	__u32 index = 0, *exclude_list;
 	int rc = 0, devmax;
 
 	/* The shortest an ost name can be is 8 chars: -OST0000.