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chan: fix potential path leak on clone in namec() (from erik quanstroms 9atom)

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

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

@@ -1472,6 +1472,10 @@

 		/* save&update the name; domount might change c */

 		path = c->path;

 		incref(path);

+		if(waserror()){

+			pathclose(path);

+			nexterror();

+		}

 		m = nil;

 		if(!nomount)

 			domount(&c, &m, &path);

@@ -1482,6 +1486,7 @@

 		/* now it's our copy anyway, we can put the name back */

 		pathclose(c->path);

 		c->path = path;

+		poperror();

 		/* record whether c is on a mount point */

 		c->ismtpt = m!=nil;

-- 

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