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devfs: dont raise "no more trees" if malloc fails

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

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

@@ -250,7 +250,7 @@

 		return nil;

 	t = trees[i] = mallocz(sizeof(Tree), 1);

 	if(t == nil)

-		return nil;

+		error(Enomem);

 	if(i == ntrees)

 		ntrees++;

 	kstrdup(&t->name, name);

@@ -675,10 +675,11 @@

 	t = lookuptree(tname);

 	if(t != nil)

 		validdevname(t, dname);

-	else

+	else{

 		t = treealloc(tname);

-	if(t == nil)

-		error("no more trees");

+		if(t == nil)

+			error("no more trees");

+	}

 	mp = devalloc(t, dname);

 	if(mp == nil){

 		if(t->ndevs == 0)	/* it was created for us */