Minor updates
if_cpsw.c: Updated to NetBSD's revision 1.21 if_cpsw_reg: Updated to NetBSD's revision 1.5 glue.h: Minor fallout from newer if_cpsw. glue.c: should cpsw_attach() fail for any reason, if_attach() never gets called, so nicifp is undefined, leading to an abort on the 1s callevery. Check nicifp is non-NULL first.