apply patch from DB: in write_file(), if we've tried to write to an

unwritable file and we're not prepending, tempname is NULL when it's
passed to unlink(); this can cause problems if unlink() can't handle
NULL, so don't call it in that case


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2012 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

src/files.c

@@ -1602,7 +1602,9 @@ int write_file(const char *name, int tmp, int append, int nonamechange)
     /* First, just give up if we couldn't even open the file. */
     if (fd == -1) {
 	statusbar(_("Error writing %s: %s"), realname, strerror(errno));
-	unlink(tempname);
+	/* tempname has been set only if we're prepending. */
+	if (tempname != NULL)
+	    unlink(tempname);
 	goto cleanup_and_exit;
     }