Staging: lustre: lnet: Declare ping_srv_workitems static

This patch makes ping_srv_workitems static as it is
used only in the file ping_test.c

This problem is detected by sparse.
Signed-off-by: Vaishali Thakkar <vthakkar1994@gmail.com>
Acked-by: Daniel Baluta <daniel.baluta@intel.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

@@ -44,7 +44,7 @@
 
 #define LST_PING_TEST_MAGIC     0xbabeface
 
-int ping_srv_workitems = SFW_TEST_WI_MAX;
+static int ping_srv_workitems = SFW_TEST_WI_MAX;
 module_param(ping_srv_workitems, int, 0644);
 MODULE_PARM_DESC(ping_srv_workitems, "# PING server workitems");