The answer to the question

	(Is there a better way to force a parse to fail from arbitrary
	places in routines called by the parser?)

asked in an earlier checkin is "yes", which would've been obvious had I
seen the code that handles MAC addresses, as it returns NULL on an
error, and the YACC clause checks for a null return value and, if the
return value is null, uses YYERROR to make the parse fail.

Use that for IPv4 and IPv6 errors.

Also, use "dfilter_fail()" for the MAC address code.

svn path=/trunk/; revision=810

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