cputlb: Tidy memset() of arrays

Don't duplicate the array length computation in the memset()
when plain sizeof() can produce the correct results.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/cputlb.c b/cputlb.c
index d2da404..9270055 100644
--- a/cputlb.c
+++ b/cputlb.c
@@ -57,7 +57,7 @@
     cpu->current_tb = NULL;
 
     memset(env->tlb_table, -1, sizeof(env->tlb_table));
-    memset(env->tb_jmp_cache, 0, TB_JMP_CACHE_SIZE * sizeof (void *));
+    memset(env->tb_jmp_cache, 0, sizeof(env->tb_jmp_cache));
 
     env->tlb_flush_addr = -1;
     env->tlb_flush_mask = 0;