x86, gcc-4.6: Fix set but not read variables

Just some dead code, no real bugs.

Found by gcc 4.6 -Wall

Signed-off-by: Andi Kleen <ak@linux.intel.com>
LKML-Reference: <201007202219.o6KMJnQ0021072@imap1.linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

arch/x86/kernel/aperture_64.c

@@ -280,7 +280,7 @@ void __init early_gart_iommu_check(void)
 	 * or BIOS forget to put that in reserved.
 	 * try to update e820 to make that region as reserved.
 	 */
-	u32 agp_aper_base = 0, agp_aper_order = 0;
+	u32 agp_aper_order = 0;
 	int i, fix, slot, valid_agp = 0;
 	u32 ctl;
 	u32 aper_size = 0, aper_order = 0, last_aper_order = 0;
@@ -291,7 +291,7 @@ void __init early_gart_iommu_check(void)
 		return;
 
 	/* This is mostly duplicate of iommu_hole_init */
-	agp_aper_base = search_agp_bridge(&agp_aper_order, &valid_agp);
+	search_agp_bridge(&agp_aper_order, &valid_agp);
 
 	fix = 0;
 	for (i = 0; i < ARRAY_SIZE(bus_dev_ranges); i++) {