target/xtensa: Correct assert condition in handle_interrupt()

In commit ad18376 we added an assert that the level value was
in-bounds for the array we're about to index into.  However, the
assert condition is wrong -- env->config->interrupt_vector is an
array of uint32_t, so we should bounds check the index against
ARRAY_SIZE(...), not against sizeof().

Resolves: Coverity CID 1507131
Fixes: ad18376 ("target/xtensa: Assert that interrupt level is within bounds")
Signed-off-by: Peter Maydell <[email protected]>
Acked-by: Max Filippov <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Message-id: [email protected]

target/xtensa/exc_helper.c

@@ -171,7 +171,7 @@ static void handle_interrupt(CPUXtensaState *env)
 
         if (level > 1) {
             /* env->config->nlevel check should have ensured this */
-            assert(level < sizeof(env->config->interrupt_vector));
+            assert(level < ARRAY_SIZE(env->config->interrupt_vector));
 
             env->sregs[EPC1 + level - 1] = env->pc;
             env->sregs[EPS2 + level - 2] = env->sregs[PS];