bin/83358: [patch] improper handling of malloc failures within rexec()

[Garrett Cooper]

>  This patch includes the fixes provided previously (minus the port var
>  removal provided by the OP), plus some style fixes and source
>  updating.
>
>  Which makes me wonder: is libcompat-4.3's rexec.c used for compiling
>  purposes at all?
>
>  -Garrett

Gmail really mangled up the patch. This one should work better:
    http://yanegomi-fbsd-patches.googlecode.com/files/4_3_compat_update.patch

-Garrett