staging: lustre: Fix sparse warnings for undeclared symbols

This patch fixes the sparse warnings in drivers/staging/lustre/lustre/ptlrpc/sec_lproc.c:
sec_lproc.c:58:6: warning: symbol 'sec_flags2str' was not declared. Should it be static?
Signed-off-by: Scott Weir <sjw0410@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/ptlrpc/sec_lproc.c

@@ -55,7 +55,7 @@
 struct proc_dir_entry *sptlrpc_proc_root = NULL;
 EXPORT_SYMBOL(sptlrpc_proc_root);
 
-char *sec_flags2str(unsigned long flags, char *buf, int bufsize)
+static char *sec_flags2str(unsigned long flags, char *buf, int bufsize)
 {
 	buf[0] = '\0';