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upas/fs: don't abort on malformed unix header

--- a/sys/src/cmd/upas/fs/mdir.c

+++ b/sys/src/cmd/upas/fs/mdir.c

@@ -32,7 +32,7 @@

 	m->unixheader = smprint("%.*s", l, m->start);

 	s = m->start + 5;

 	if((p = strchr(s, ' ')) == nil)

-		abort();

+		return;

 	*p = 0;

 	m->unixfrom = strdup(s);

 	*p = ' ';

@@ -117,6 +117,7 @@

 	Message *m, **ll;

 	static char err[ERRMAX];

+	err[0] = '\0';

 	if((fd = open(mb->path, OREAD)) == -1){

 		errstr(err, sizeof err);

 		return err;