The null pointer checks for members of the data structure "MessageComponent" are not needed for the delete instructions in the function "SendingMessage::freeMessageComponent".
http://dietmar-kuehl.de/mirror/c++-faq/freestore-mgmt.html#faq-16.8
http://sipp.svn.sourceforge.net/viewvc/sipp/sipp/trunk/message.cpp?revision=423&view=markup
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Some free() and new operator calls were also affected.
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