x86 MTRR: Drop unused return value

It was never well-defined what value this function should return.

Change-Id: If84aff86e0b556591d7ad557842910a2dfcd3b46
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/6166
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
diff --git a/src/cpu/x86/mtrr/mtrr.c b/src/cpu/x86/mtrr/mtrr.c
index 8826535..b19b853 100644
--- a/src/cpu/x86/mtrr/mtrr.c
+++ b/src/cpu/x86/mtrr/mtrr.c
@@ -772,7 +772,7 @@
 	x86_setup_var_mtrrs(address_size, 1);
 }
 
-int x86_mtrr_check(void)
+void x86_mtrr_check(void)
 {
 	/* Only Pentium Pro and later have MTRR */
 	msr_t msr;
@@ -795,5 +795,4 @@
 	printk(BIOS_DEBUG, "\n");
 
 	post_code(0x93);
-	return ((int) msr.lo);
 }