* sysdeps/unix/sysv/linux/ifreq.c (__ifreq): Fix memory handling.
* sysdeps/generic/ifreq.c (__ifreq): Fix memory handling.
* resolv/res_hconf.c (_res_hconf_reorder_addrs): Make clear that
realloc cannot fail.
* nss/nss_files/files-netgrp.c (EXPAND): Free buffer which cannot
be expanded.
* nis/nis_table.c: Clean up memory handling.
* nis/nis_subr.c (nis_getnames): Clean up memory handling.
* nis/nis_removemember.c (nis_removemember): Add comment
explaining use of realloc.
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