RDMA/cxgb4: Make c4iw_wr_log_size_order static

This fixes a sparse warning.
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

drivers/infiniband/hw/cxgb4/device.c

@@ -60,7 +60,7 @@ int c4iw_wr_log = 0;
 module_param(c4iw_wr_log, int, 0444);
 MODULE_PARM_DESC(c4iw_wr_log, "Enables logging of work request timing data.");
 
-int c4iw_wr_log_size_order = 12;
+static int c4iw_wr_log_size_order = 12;
 module_param(c4iw_wr_log_size_order, int, 0444);
 MODULE_PARM_DESC(c4iw_wr_log_size_order,
 		 "Number of entries (log2) in the work request timing log.");