mtd/m25p80: fix test for end of loop

"plat_id" is always non-NULL here. There is a zero element on the end
of the m25p_ids[] array and if we hit the end of the loop then plat_id
points to that.

This would lead to a NULL pointer dereference later on in the function.

Signed-off-by: Dan Carpenter <[e-mail]>
Acked-by: Anton Vorontsov <[e-mail]>
Signed-off-by: David Woodhouse <[e-mail]>

drivers/mtd/devices/m25p80.c

···
 			break;
 		}
 
-		if (plat_id)
+		if (i < ARRAY_SIZE(m25p_ids) - 1)
 			id = plat_id;
 		else
 			dev_warn(&spi->dev, "unrecognized id %s\n", data->type);