The if_em driver has conditional statements so that it can support versions of FreeBSD before 602111. There is a missing conditional statement in if_em.c that prevents a compiler warning which becomes an error while compiling the kernel. Fix: Apply the attached fix to RELENG_6 Patch attached with submission follows: How-To-Repeat: Try and compile the if_em driver in RELENG_6 on a system that is older than 602111.
Responsible Changed From-To: freebsd-bugs->jfv Over to maintainer.
FreeBSD 6 is EOL and there are no longer any version checks for FreeBSD versions less than 8 in if_em.c