How to correctly release a CGMutablePathRef in -dealloc?

Problem: Maybe the CGMutablePathRef has been created and set, but maybe not.

What I do right now in -dealloc is:

if (path != N开发者_StackOverflow社区ULL) {
    CGPathRelease(path);
    path = NULL;
}

Is this correct?

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From the manual,

void CGPathRelease ( CGPathRef path );

This function is equivalent to CFRelease, except that it does not cause an error if the path parameter is NULL.

So there is no need to NULL check.