staging: lustre: re-use kbasename() common helper

To get the name of a file from a pathname we may use kbasename() helper.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/libcfs/tracefile.c

@@ -275,12 +275,9 @@ int libcfs_debug_vmsg2(struct libcfs_debug_msg_data *msgdata,
 	int			i;
 	int			remain;
 	int			mask = msgdata->msg_mask;
-	char		      *file = (char *)msgdata->msg_file;
+	const char		*file = kbasename(msgdata->msg_file);
 	cfs_debug_limit_state_t   *cdls = msgdata->msg_cdls;
 
-	if (strchr(file, '/'))
-		file = strrchr(file, '/') + 1;
-
 	tcd = cfs_trace_get_tcd();
 
 	/* cfs_trace_get_tcd() grabs a lock, which disables preemption and