x86, espfix: Remove stale ptemask

Previous versions of the espfix had a single function which did setup
the pagetables. It was later split into BSP and AP version. Drop unused
leftovers after that split.
Signed-off-by: NBorislav Petkov <bp@suse.de>

arch/x86/kernel/espfix_64.c

@@ -122,9 +122,6 @@ static void init_espfix_random(void)
 void __init init_espfix_bsp(void)
 {
 	pgd_t *pgd_p;
-	pteval_t ptemask;
-
-	ptemask = __supported_pte_mask;
 
 	/* Install the espfix pud into the kernel page directory */
 	pgd_p = &init_level4_pgt[pgd_index(ESPFIX_BASE_ADDR)];