curl_formfree.3: mention argument may be NULL
As the code already checks for it we can just as well make it official!
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@ -31,6 +31,9 @@ curl_formfree - free a previously build multipart/formdata HTTP POST chain
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curl_formfree() is used to clean up data previously built/appended with
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\fIcurl_formadd(3)\fP. This must be called when the data has been used, which
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typically means after \fIcurl_easy_perform(3)\fP has been called.
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\fBform\fP is the pointer as returned from a previous call to
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\fIcurl_formadd(3)\fP and may be NULL.
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.SH RETURN VALUE
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None
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.SH "SEE ALSO"
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