nfs: do not initialise statics to 0

This patch fixes the checkpatch.pl error to nfs4sysctl.c:

ERROR: do not initialise statics to 0
Signed-off-by: NWei Tang <tangwei@cmss.chinamobile.com>
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/nfs4sysctl.c

@@ -12,7 +12,7 @@
 #include "nfs4idmap.h"
 #include "callback.h"
 
-static const int nfs_set_port_min = 0;
+static const int nfs_set_port_min;
 static const int nfs_set_port_max = 65535;
 static struct ctl_table_header *nfs4_callback_sysctl_table;