device/pnp_device: Remove return statement from void function

Change-Id: Ie766807ae1538b21acf471cfacbfe75cfeead921
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77187
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>

src/device/pnp_device.c

@@ -113,7 +113,6 @@ void pnp_set_drq(struct device *dev, u8 index, u8 drq)
 
 void pnp_read_resources(struct device *dev)
 {
-	return;
 }
 
 static void pnp_set_resource(struct device *dev, struct resource *resource)