updated objc_msgSend routine to fix compiler warning

Author: grevolution

SHModelObject/SHModelObject/SHRealmObject.m

@@ -316,7 +316,7 @@ - (void)serializeValue:(id)value withKey:(id)key {
                 if (isSHRealmObject) {
 
                     NSString *propName = [ivarName substringFromIndex:1];
-                    id realmArray = objc_msgSend(self, NSSelectorFromString(propName));
+                    id realmArray = ((id (*)(id, SEL))objc_msgSend)(self, NSSelectorFromString(propName));
                     for (id item in value) {
                         // item should be a dictionary
                         if ([item isKindOfClass:[NSDictionary class]]) {