Add NULL check to cJSON_SetValuestring() #840
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If the valuestring passed to cJSON_SetValuestring is NULL, a null pointer dereference will happen. This commit adds the NULL check of valuestring before it is dereferenced.
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If the valuestring passed to cJSON_SetValuestring is NULL, a null pointer dereference will happen.
This commit adds the NULL check of valuestring before it is dereferenced.
fixes: #839