bcm43xx_debugfs sscanf fix

ia64:

drivers/net/wireless/bcm43xx/bcm43xx_debugfs.c: In function `tsf_write_file':
drivers/net/wireless/bcm43xx/bcm43xx_debugfs.c:237: warning: long long int format, u64 arg (arg 3)
drivers/net/wireless/bcm43xx/bcm43xx_debugfs.c:237: warning: long long int format, u64 arg (arg 3)

We do not know what type was used to implement u64 and we can never use u64 in
printk(), sscanf(), etc.

Cc: Michael Buesch <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

drivers/net/wireless/bcm43xx/bcm43xx_debugfs.c

···
 	ssize_t buf_size;
 	ssize_t res;
 	unsigned long flags;
-	u64 tsf;
+	unsigned long long tsf;
 
 	buf_size = min(count, sizeof (really_big_buffer) - 1);
 	down(&big_buffer_sem);