x86: GART: pci-gart_64.c: Use correct length in strncmp

Signed-off-by: NJoe Perches <joe@perches.com>
Cc: <stable@kernel.org> # .3x.x
LKML-Reference: <1257818330.12852.72.camel@Joe-Laptop.home>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/pci-gart_64.c

@@ -858,7 +858,7 @@ void __init gart_parse_options(char *p)
 #endif
 	if (isdigit(*p) && get_option(&p, &arg))
 		iommu_size = arg;
-	if (!strncmp(p, "fullflush", 8))
+	if (!strncmp(p, "fullflush", 9))
 		iommu_fullflush = 1;
 	if (!strncmp(p, "nofullflush", 11))
 		iommu_fullflush = 0;