SOCK_DEBUG message simplification

Status from this message: Applied.

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b4 am 1237486504.30285.15.camel@f6bvp-11

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#	Subject and files	Size	Replies
1/3	SOCK_DEBUG message simplification`net/ax25/af_ax25.c`	+1 -3	0 replies
1/3	SOCK_DEBUG message simplification`net/ax25/af_ax25.c`	+1 -3	1 reply
2/3	zero length frame filtering in AX25`net/ax25/af_ax25.c`	+12 -0	0 replies
2/3	zero length frame filtering in AX25`net/ax25/af_ax25.c`	+12 -0	1 reply
3/3	zero length frame filtering in NetRom`net/netrom/af_netrom.c`	+10 -1	2 replies

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