target/ppc/mmu_common.c: Remove single use local variable

The ptem variable in ppc6xx_tlb_pte_check() is used only once,
simplify by removing it as the value is already clear itself without
adding a local name for it.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
diff --git a/target/ppc/mmu_common.c b/target/ppc/mmu_common.c
index 2618cde..371ec24 100644
--- a/target/ppc/mmu_common.c
+++ b/target/ppc/mmu_common.c
@@ -98,7 +98,6 @@
                                 target_ulong pte1, int h,
                                 MMUAccessType access_type)
 {
-    target_ulong ptem;
     int ret, pteh, ptev, pp;
 
     ret = -1;
@@ -107,9 +106,8 @@
     pteh = (pte0 >> 6) & 1;
     if (ptev && h == pteh) {
         /* Check vsid & api */
-        ptem = pte0 & PTE_PTEM_MASK;
         pp = pte1 & 0x00000003;
-        if (ptem == ctx->ptem) {
+        if ((pte0 & PTE_PTEM_MASK) == ctx->ptem) {
             if (ctx->raddr != (hwaddr)-1ULL) {
                 /* all matches should have equal RPN, WIMG & PP */
                 if ((ctx->raddr & PTE_CHECK_MASK) != (pte1 & PTE_CHECK_MASK)) {