staging: mt7621-mmc: Fix debug file world writable

Currently the debug file in proc fs is world writable, remove the
access for other.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Christian Lütke-Stetzkamp <christian@lkamp.de>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-mmc/dbg.c

@@ -339,7 +339,7 @@ static const struct file_operations msdc_debug_fops = {
 
 void msdc_debug_proc_init(void)
 {
-	proc_create("msdc_debug", 0667, NULL, &msdc_debug_fops);
+	proc_create("msdc_debug", 0660, NULL, &msdc_debug_fops);
 }
 EXPORT_SYMBOL_GPL(msdc_debug_proc_init);
 #endif