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port: sync two longjmp fixes from drawterm

see drawterm commits f5e26ae93a6a and fa388286b4ca

--- a/sys/src/9/port/chan.c

+++ b/sys/src/9/port/chan.c

@@ -1277,8 +1277,9 @@

 namec(char *aname, int amode, int omode, ulong perm)

 {

 	int len, n, t, nomount;

-	Chan *c, *cnew;

-	Path *path;

+	Chan *c;

+	Chan *volatile cnew;

+	Path *volatile path;

 	Elemlist e;

 	Rune r;

 	Mhead *m;