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

The following patch makes a function static as it is not used by other
files.
The patch fixes the following warning:
WARNING: symbol brw_inject_one_error 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

@@ -131,7 +131,7 @@ brw_client_init(sfw_test_instance_t *tsi)
 #define BRW_MAGIC       0xeeb0eeb1eeb2eeb3ULL
 #define BRW_MSIZE       sizeof(__u64)
 
-int
+static int
 brw_inject_one_error(void)
 {
 	struct timeval tv;