target-sh4: fix TLB invalidation code

In cpu_sh4_invalidate_tlb, the UTLB was invalidated twice and the
ITLB left unchaged, probably because of some unfortunate copy/paste.
Signed-off-by: NAlexandre Courbot <gnurou@gmail.com>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

target-sh4/helper.c

@@ -559,8 +559,8 @@ void cpu_load_tlb(CPUSH4State * env)
         entry->v = 0;
     }
     /* ITLB */
-    for (i = 0; i < UTLB_SIZE; i++) {
-        tlb_t * entry = &s->utlb[i];
+    for (i = 0; i < ITLB_SIZE; i++) {
+        tlb_t * entry = &s->itlb[i];
         entry->v = 0;
     }