select: autogenerator: No need to NULL guard lwc_string_unref

Author: tlsa

src/select/autogenerated_propset.h

@@ -127,8 +127,7 @@ static inline css_error set_background_image(css_computed_style *style, uint8_t
 		style->i.background_image = NULL;
 	}
 
-	if (old_string != NULL)
-		lwc_string_unref(old_string);
+	lwc_string_unref(old_string);
 
 	return CSS_OK;
 }
@@ -1440,8 +1439,7 @@ static inline css_error set_list_style_image(css_computed_style *style, uint8_t
 		style->i.list_style_image = NULL;
 	}
 
-	if (old_string != NULL)
-		lwc_string_unref(old_string);
+	lwc_string_unref(old_string);
 
 	return CSS_OK;
 }

src/select/select_generator.py

@@ -588,10 +588,7 @@ def make_propset_h(self):
                     t.indent(-1)
                     t.append('}')
                     t.append()
-                    t.append('if ({} != NULL)'.format(old_n))
-                    t.indent(1)
                     t.append('lwc_string_unref({});'.format(old_n))
-                    t.indent(-1)
 
                 elif v.name == 'string_arr' or v.name == 'counter_arr':
                     iter_var = 's' if v.name == 'string_arr' else 'c'