mcp23s08: check read_regs() retval

The return value of mcp23s08_read_regs() can only be evaluated when signed

---

index bb60e8c..0eef8b8 100644
@@ -168,7 +168,7 @@ static void mcp23s08_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 {
 	struct mcp23s08	*mcp;
 	char		bank;
-	unsigned	t;
+	int		t;
 	unsigned	mask;
 
 	mcp = container_of(chip, struct mcp23s08, chip);

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