cmd/memtest: don't die if /proc/self/status is the wrong format.
cmd/memtest: don't die if /proc/self/status is the wrong format.

Apparently Solaris has /proc/self/status, but it's binary and so our
Linux-centric parser couldn't handle it.  The data we're getting from it is
non-critical, so just ignore the parse error and let the high-level code in
report() deal with it.

Reported by henning mueller, diagnosed by Gabriel Filion.  Thanks guys!

Signed-off-by: Avery Pennarun <e03ccfb89d416c4697ad6970ce86a92c1c28a78e@gmail.com>

gevaerts/bup,mhoeher/bup,ToxicFrog/bup,pombredanne/bup,apenwarr/bup,jbaber/bup,pombredanne/bup,tjanez/bup,tjanez/bup,mhoeher/bup,apenwarr/bup,gevaerts/bup,apenwarr/bup,pombredanne/bup,pombredanne/bup,gevaerts/bup,mhoeher/bup,ToxicFrog/bup,mhoeher/bup,ToxicFrog/bup,apenwarr/bup,tjanez/bup,tjanez/bup,mhoeher/bup,ToxicFrog/bup,gevaerts/bup,jbaber/bup,pombredanne/bup,ToxicFrog/bup,jbaber/bup,mhoeher/bup,jbaber/bup,jbaber/bup,jbaber/bup,gevaerts/bup,tjanez/bup,pombredanne/bup,tjanez/bup