dahdi-sysfs-chan: Fix potential NULL pointer deref

Sometimes it is useful to look at compiler warnings:

dahdi-sysfs-chan.c:384:17: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation]

And indeed, we could have de-referenced a NULL pointer here.

Change-Id: I4274e7a92ca6ee7e92c6adb713fb89ffe31b4c72

drivers/dahdi/dahdi-sysfs-chan.c

@@ -381,10 +381,11 @@ static void fixed_devfiles_remove(void)
 		return;
 	for (i = 0; i < ARRAY_SIZE(fixed_minors); i++) {
 		void *d = fixed_minors[i].dev;
-		if (d && !IS_ERR(d))
+		if (d && !IS_ERR(d)) {
 			dahdi_dbg(DEVICES, "Removing fixed device file %s\n",
 				fixed_minors[i].name);
 			DEL_DAHDI_DEV(fixed_minors[i].minor);
+		}
 	}
 }