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The adjmsg() function removes bytes from a message. |len| (the absolute value of len) specifies the number of bytes to be removed.
The adjmsg() function only trims bytes across message blocks of the same type.
The adjmsg() function finds the maximal leading sequence of message blocks of the same type as that of mp and starts removing bytes either from the head
of that sequence or from the tail of that sequence. If len is greater than 0, adjmsg() removes bytes from the start of the first message
block in that sequence. If len is less than 0, it removes bytes from the end of the last message block in that sequence.
The adjmsg() function fails if |len| is greater than the number of bytes in the maximal leading sequence it finds.
The adjmsg() function may remove any except the first zero-length message block created during adjusting. It may also remove any zero-length message blocks that occur within the
scope of |len|.
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