libgm2/libm2pim/sckt.cc:254:3: warning: memset() called to fill 0 bytes [PR108944]

The pattern parameter to memset is second.  Correct an obvious mistake
in libm2pim/sckt.cc.

libgm2/ChangeLog:

	PR modula2/108944
	* libm2pim/sckt.cc (getLocalIP): Correct parameter order.

Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>