smb: minor fix to use sizeof to initialize flags_string buffer

Replaced hardcoded length with sizeof(flags_string).

Reviewed-by: Paulo Alcantara (Red Hat) <[e-mail]>
Signed-off-by: Bharath SM <[e-mail]>
Signed-off-by: Steve French <[e-mail]>

fs/smb/client/cifs_debug.c

···
 	if ((count < 1) || (count > 11))
 		return -EINVAL;
 
-	memset(flags_string, 0, 12);
+	memset(flags_string, 0, sizeof(flags_string));
 
 	if (copy_from_user(flags_string, buffer, count))
 		return -EFAULT;