readnames() was missing from rw?stat and resulted in a null
dereference.

Reference: /n/atom/patch/applied2013/lnfsnit
Date: Fri May 31 01:30:57 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/lnfs/lnfs.c	Fri May 31 01:30:28 2013
+++ /sys/src/cmd/lnfs/lnfs.c	Fri May 31 01:30:28 2013
@@ -472,6 +472,7 @@
 	d = dirstat(s_to_c(f->path));
 	if(d == nil)
 		return passerror();
+	readnames();
 	d->name = short2long(d->name);
 	n = convD2M(d, statbuf, sizeof statbuf);
 	free(d);
@@ -491,6 +492,7 @@
 	if(readonly)
 		return Eperm;
 	convM2D(thdr.stat, thdr.nstat, &d, (char*)rdata);
+	readnames();
 	d.name = long2short(d.name, 1);
 	n = dirwstat(s_to_c(f->path), &d);
 	if(n < 0)
@@ -797,6 +799,8 @@
 
 	shorttolong = mkavltree(namecmp);
 	longtoshort = mkavltree(namecmp);
+	if(shorttolong == nil || longtoshort == nil)
+		sysfatal("lnfs: malloc: %r");
 }
 
 /*