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devsegment: fix parsecmd() memory leak

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

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

@@ -315,6 +315,10 @@

 	switch(TYPE(c)){

 	case Qctl:

 		cb = parsecmd(a, n);

+		if(waserror()){

+			free(cb);

+			nexterror();

+		}

 		if(strcmp(cb->f[0], "va") == 0){

 			if(g->s != nil)

 				error("already has a virtual address");

@@ -335,6 +339,8 @@

 				g->s = newseg(SG_SHARED, va, len);

 		} else

 			error(Ebadctl);

+		free(cb);

+		poperror();

 		break;

 	case Qdata:

 		return segio(g, g->s, a, n, voff, 0);