Revert "utilfdt_read: pass back up the length of data read"

This reverts commit cc2c178727cdeca4eb9756637c2e09e50e0856e7.
It was the wrong version of the patch.
diff --git a/util.h b/util.h
index e09cc25..3f02cd8 100644
--- a/util.h
+++ b/util.h
@@ -80,10 +80,9 @@
  * stderr.
  *
  * @param filename	The filename to read, or - for stdin
- * @param len		If non-NULL, the amount of data we managed to read
  * @return Pointer to allocated buffer containing fdt, or NULL on error
  */
-char *utilfdt_read(const char *filename, off_t *len);
+char *utilfdt_read(const char *filename);
 
 /**
  * Read a device tree file into a buffer. Does not report errors, but only
@@ -92,10 +91,9 @@
  *
  * @param filename	The filename to read, or - for stdin
  * @param buffp		Returns pointer to buffer containing fdt
- * @param len		If non-NULL, the amount of data we managed to read
  * @return 0 if ok, else an errno value representing the error
  */
-int utilfdt_read_err(const char *filename, char **buffp, off_t *len);
+int utilfdt_read_err(const char *filename, char **buffp);
 
 
 /**