cbmem_top_chipset: Change the return value to uintptr_t

Get rid of a lot of casts.

Change-Id: I93645ef5dd270905ce421e68e342aff4c331eae6
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69078
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jakub Czapiga <jacz@semihalf.com>
diff --git a/src/mainboard/emulation/qemu-i440fx/memmap.c b/src/mainboard/emulation/qemu-i440fx/memmap.c
index 75ab352..efe83c3 100644
--- a/src/mainboard/emulation/qemu-i440fx/memmap.c
+++ b/src/mainboard/emulation/qemu-i440fx/memmap.c
@@ -41,7 +41,7 @@
 	return tomk;
 }
 
-void *cbmem_top_chipset(void)
+uintptr_t cbmem_top_chipset(void)
 {
 	uintptr_t top = 0;
 
@@ -56,7 +56,7 @@
 		smm_region(&top, &smm_size);
 	}
 
-	return (void *)top;
+	return top;
 }
 
 /* Nothing to do, MTRRs are no-op on QEMU. */