SH4: Fixed last UTLB unused

With my previous patch (the one monitoring tlb), I found that the last
TLB entry was never use. Here a little fix.
Signed-off-by: NLionel Landwerlin <lionel.landwerlin@openwide.fr>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6671 c046a42c-6fe2-441c-8c8c-71466251a162

target-sh4/helper.c

@@ -304,7 +304,7 @@ static void increment_urc(CPUState * env)
     urb = ((env->mmucr) >> 18) & 0x3f;
     urc = ((env->mmucr) >> 10) & 0x3f;
     urc++;
-    if (urc == urb || urc == UTLB_SIZE - 1)
+    if (urc == urb || urc == UTLB_SIZE)
 	urc = 0;
     env->mmucr = (env->mmucr & 0xffff03ff) | (urc << 10);
 }