Merge pull request #1696 from pguyot/w24/simplify-test_arity-2

Simplify test_arity/2 as it assumes arg is a tuple

These changes are made under both the "Apache 2.0" and the "GNU Lesser General
Public License 2.1 or later" license terms (dual license).

SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later

Author: bettio

src/libAtomVM/opcodesswitch.h

@@ -3172,7 +3172,8 @@ HOT_FUNC int scheduler_entry_point(GlobalContext *glb)
                 #ifdef IMPL_EXECUTE_LOOP
                     TRACE("test_arity/2, label=%i, arg1=%lx\n", label, arg1);
 
-                    if (!(term_is_tuple(arg1) && (uint32_t) term_get_tuple_arity(arg1) == arity)) {
+                    assert(term_is_tuple(arg1));
+                    if ((uint32_t) term_get_tuple_arity(arg1) != arity) {
                         pc = mod->labels[label];
                     }
                 #endif