Robert Watson 2432c31c8b In multicast routines:
Compare pointers with NULL rather than treating them as booleans.

Compare pointers with NULL rather than 0 to make it more clear
they are pointers.

Assign pointers value of NULL rather than 0 to make it more clear
they are pointers.

MFC after:	3 days
2005-07-19 10:12:58 +00:00
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