a366213452
Fix two bugs: - The ftpPassive() function seemed to think that the PASV command is a toggle. This is not true (however, the ftp(1) "pass" command is indeed a toggle). So no need to emit a "PASV" command each time this function is called; that's handled by ftp_file_op(). - check_passive() is supposed to check if FTP_PASSIVE_MODE is defined, and if so, override ftpPassive(). However, it was overriding ftpPassive() even if FTP_PASSIVE_MODE was not defined, rendering calls to the ftpPassive() function completely ineffectual. Also, clarify the relationship between ftpPassive() and the FTP_PASSIVE_MODE environment variable in the man page.
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