staging: lustre: remove initialisation of static variable

Fix the following checkpatch.pl error:

ERROR: do not initialise statics to 0 or NULL
+static int       libcfs_nidstring_idx = 0;
Signed-off-by: Teodora Baluta <teobaluta@gmail.com>
Reviewed-by: Lisa Nguyen <lisa@xenapiadmin.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/libcfs/nidstrings.c

@@ -56,7 +56,7 @@
  */
 
 static char      libcfs_nidstrings[LNET_NIDSTR_COUNT][LNET_NIDSTR_SIZE];
-static int       libcfs_nidstring_idx = 0;
+static int       libcfs_nidstring_idx;
 
 static spinlock_t libcfs_nidstring_lock;