The nng_strfree() function deallocates the string str.
This is equivalent to using nng_free() with
the length of str plus one (for the NUL terminating byte) as
the size.
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Important
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This should only be used with strings that were allocated
by nng_strdup() or
nng_alloc().
In all cases, the allocation size of the string must be the same
as strlen(str) + 1.
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Important
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Consequently, if the a string created with
nng_strdup() is modified to be shorter, then
it is incorrect to call this function.
(The nng_free() function can be used instead in that
case, using the length of the original string plus one for the size.)
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