This creates a 8051 build that can run in 24Kb of RAM

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@26 42af7a65-404d-4744-a932-0658087f49c3

drivers/dev_null.c

@@ -61,11 +61,11 @@ static ssize_t devnull_write(struct file *, const char *, size_t);
 
 static struct file_operations devnull_fops =
 {
-  NULL,          /* open */
-  NULL,          /* close */
+  0,             /* open */
+  0,             /* close */
   devnull_read,  /* read */
   devnull_write, /* write */
-  NULL           /* ioctl */
+  0              /* ioctl */
 };
 
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