cJSON_GetObjectItemCaseSensitive: Fix inconsistent prototype

Thanks @PawelWMS

cJSON.h

@@ -149,7 +149,7 @@ CJSON_PUBLIC(int) cJSON_GetArraySize(const cJSON *array);
 /* Retrieve item number "item" from array "array". Returns NULL if unsuccessful. */
 CJSON_PUBLIC(cJSON *) cJSON_GetArrayItem(const cJSON *array, int item);
 /* Get item "string" from object. Case insensitive. */
-CJSON_PUBLIC(cJSON *) cJSON_GetObjectItem(const cJSON *object, const char *string);
+CJSON_PUBLIC(cJSON *) cJSON_GetObjectItem(const cJSON * const object, const char * const string);
 CJSON_PUBLIC(cJSON *) cJSON_GetObjectItemCaseSensitive(const cJSON *object, const char *string);
 CJSON_PUBLIC(cJSON_bool) cJSON_HasObjectItem(const cJSON *object, const char *string);
 /* For analysing failed parses. This returns a pointer to the parse error. You'll probably need to look a few chars back to make sense of it. Defined when cJSON_Parse() returns 0. 0 when cJSON_Parse() succeeds. */