spi: bcm2835aux: polling_limit_us can be static

Fixes: 5fd917afc4 ("spi: bcm2835aux: make the polling duration limits configurable")
Signed-off-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-bcm2835aux.c

@@ -38,7 +38,7 @@
 #include <linux/spinlock.h>
 
 /* define polling limits */
-unsigned int polling_limit_us = 30;
+static unsigned int polling_limit_us = 30;
 module_param(polling_limit_us, uint, 0664);
 MODULE_PARM_DESC(polling_limit_us,
 		 "time in us to run a transfer in polling mode - if zero no polling is used\n");