checker: fix compiler crashes when passing an extra decompose parameter to a function(fix: 18995) (#18996)

Author: shove70

vlib/v/checker/fn.v

@@ -2304,7 +2304,7 @@ fn (mut c Checker) check_expected_arg_count(mut node ast.CallExpr, f &ast.Fn) !
 		has_decompose := node.args.filter(it.expr is ast.ArrayDecompose).len > 0
 		if has_decompose {
 			// if call(...args) is present
-			min_required_params = nr_args
+			min_required_params = nr_args - 1
 		}
 	}
 	if min_required_params < 0 {

vlib/v/checker/tests/fn_array_decompose_arg_mismatch_err_c.out

@@ -0,0 +1,6 @@
+vlib/v/checker/tests/fn_array_decompose_arg_mismatch_err_c.vv:2:6: error: expected 0 arguments, but got 1
+    1 | fn main() {
+    2 |     foo(...args)
+      |         ~~~~~~~
+    3 | }
+    4 |

vlib/v/checker/tests/fn_array_decompose_arg_mismatch_err_c.vv

@@ -0,0 +1,6 @@
+fn main() {
+	foo(...args)
+}
+
+fn foo() {
+}