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BITCONSTSIGN

Message        <Context> the integer constant "<constant>" does not
               have the same sign as the 1-bit bitfield it is being
               converted to.

Description    Either an unsigned 1-bit bitfield was assigned -1, or
               a signed 1-bit bitfield was assigned 1.  This may not
               be what you intended.

User Action    Change the constant to be the appropriate sign.