staging: usbip: export usbip_debug_flag as a usbip-core module parameter.

Now usbip_common.c's pr_fmt is the only thing setup by CONFIG_USBIP_DEBUG
that you can't subsequently alter using this parameter.

Signed-off-by: W. Trevor King <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/usbip/usbip_common.c

···
 #include <linux/fs.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
+#include <linux/stat.h>
 #include <linux/module.h>
+#include <linux/moduleparam.h>
 #include <net/sock.h>
 
 #include "usbip_common.h"
···
 unsigned long usbip_debug_flag;
 #endif
 EXPORT_SYMBOL_GPL(usbip_debug_flag);
+module_param(usbip_debug_flag, ulong, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(usbip_debug_flag, "debug flags (defined in usbip_common.h)");
 
 /* FIXME */
 struct device_attribute dev_attr_usbip_debug;