lib: Remove useless memcpy() calls in node allocators

Fairly ugly that we even have these tiny dynamic allocs here for copying
node trees, but at least now we don't have memcpy cluttering it as well.

src/common/node_parse.c

@@ -70,7 +70,7 @@ static enum cr_math_op value_node_op(const cJSON *data) {
 
 static struct cr_value_node *vn_alloc(struct cr_value_node d) {
 	struct cr_value_node *desc = calloc(1, sizeof(*desc));
-	memcpy(desc, &d, sizeof(*desc));
+	*desc = d;
 	return desc;
 }
 
@@ -197,7 +197,7 @@ void cr_value_node_free(struct cr_value_node *d) {
 
 static struct cr_color_node *cn_alloc(struct cr_color_node d) {
 	struct cr_color_node *desc = calloc(1, sizeof(*desc));
-	memcpy(desc, &d, sizeof(*desc));
+	*desc = d;
 	return desc;
 }
 
@@ -497,7 +497,7 @@ void cr_color_node_free(struct cr_color_node *d) {
 
 static struct cr_vector_node *vecn_alloc(struct cr_vector_node d) {
 	struct cr_vector_node *desc = calloc(1, sizeof(*desc));
-	memcpy(desc, &d, sizeof(*desc));
+	*desc = d;
 	return desc;
 }
 
@@ -631,7 +631,7 @@ void cr_vector_node_free(struct cr_vector_node *d) {
 
 static struct cr_shader_node *bn_alloc(struct cr_shader_node d) {
 	struct cr_shader_node *desc = calloc(1, sizeof(*desc));
-	memcpy(desc, &d, sizeof(*desc));
+	*desc = d;
 	return desc;
 }