mcb: fix compiler warning logical-op in mcb-parse.c

The expression was clearly wrong, the logical AND of expressions
must be changed to a logical OR.

Reported-by: David Binderman <dcb314@hotmail.com>
Signed-off-by: Michael Moese <michael.moese@men.de>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>