Staging: lustre: lnet: selftest: Made a function static.

The following patch makes a function static as it was not used by other
files.
The patch fixes the following warning:
WARNING: symbol brw_client_init was not declared. Should it be static?

The above warning was reported by sparse.
Signed-off-by: Heena Sirwani <heenasirwani@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lnet/selftest/brw_test.c

@@ -66,7 +66,7 @@ brw_client_fini(sfw_test_instance_t *tsi)
 	}
 }
 
-int
+static int
 brw_client_init(sfw_test_instance_t *tsi)
 {
 	sfw_session_t	 *sn = tsi->tsi_batch->bat_session;