cgen: fix assert fn_call with parentheses (fix #11207) (#11214)

vlib/v/gen/c/assert.v

@@ -14,9 +14,17 @@ fn (mut g Gen) gen_assert_stmt(original_assert_statement ast.AssertStmt) {
 	if mut node.expr is ast.InfixExpr {
 		if mut node.expr.left is ast.CallExpr {
 			node.expr.left = g.new_ctemp_var_then_gen(node.expr.left, node.expr.left_type)
+		} else if mut node.expr.left is ast.ParExpr {
+			if node.expr.left.expr is ast.CallExpr {
+				node.expr.left = g.new_ctemp_var_then_gen(node.expr.left.expr, node.expr.left_type)
+			}
 		}
 		if mut node.expr.right is ast.CallExpr {
 			node.expr.right = g.new_ctemp_var_then_gen(node.expr.right, node.expr.right_type)
+		} else if mut node.expr.right is ast.ParExpr {
+			if node.expr.right.expr is ast.CallExpr {
+				node.expr.right = g.new_ctemp_var_then_gen(node.expr.right.expr, node.expr.right_type)
+			}
 		}
 	}
 	g.inside_ternary++

vlib/v/tests/assert_fn_call_with_parentheses_test.v

@@ -0,0 +1,7 @@
+fn foo(fail bool) ?string {
+	return if fail { error('failure') } else { 'success' }
+}
+
+fn test_assert_fn_call_with_parentheses() {
+	assert (foo(true) or { '' }) == ''
+}