tpm/tpm-sysfs: active_show() can be static

so we make it static

CC: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
CC: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: NFengguang Wu <fengguang.wu@intel.com>
Signed-off-by: NPeter Huewe <peterhuewe@gmx.de>

drivers/char/tpm/tpm-sysfs.c

@@ -148,7 +148,7 @@ static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
 }
 static DEVICE_ATTR_RO(enabled);
 
-ssize_t active_show(struct device *dev, struct device_attribute *attr,
+static ssize_t active_show(struct device *dev, struct device_attribute *attr,
 		    char *buf)
 {
 	cap_t cap;