Fix (-W)documentation error found by Clang

./packet-mstp.h:31:13: error: empty paragraph passed to '@param' command
      [-Werror,-Wdocumentation]
 * @param val
   ~~~~~~~~~^
./packet-mstp.h:41:13: error: empty paragraph passed to '@param' command
      [-Werror,-Wdocumentation]
 * @param tvb
   ~~~~~~~~~^
./packet-mstp.h:42:15: error: empty paragraph passed to '@param' command
      [-Werror,-Wdocumentation]
 * @param pinfo
   ~~~~~~~~~~~^
./packet-mstp.h:43:14: error: empty paragraph passed to '@param' command
      [-Werror,-Wdocumentation]
 * @param tree
   ~~~~~~~~~~^
./packet-mstp.h:44:17: error: empty paragraph passed to '@param' command
      [-Werror,-Wdocumentation]
 * @param subtree
   ~~~~~~~~~~~~~^
./packet-mstp.h:45:16: error: empty paragraph passed to '@param' command
      [-Werror,-Wdocumentation]
 * @param offset
   ~~~~~~~~~~~~^
./packet-mstp.h:46:5: error: '@return' command used in a comment that is
      attached to a function returning void [-Werror,-Wdocumentation]
 * @return none
   ~^~~~~~~~~~~

svn path=/trunk/; revision=51264

epan/dissectors/packet-mstp.h

@@ -28,7 +28,7 @@
 
 /**
  * Returns a value string for the BACnet MS/TP Frame Type.
- * @param val
+ * @param val BACnet MS/TP Frame value
  * @return constant C String with MS/TP Frame Type
  */
 const gchar *
@@ -38,12 +38,11 @@ mstp_frame_type_text(guint32 val);
  * Dissects the BACnet MS/TP packet after the preamble,
  * starting with the MS/TP Frame type octet.  Passes
  * the PDU, if there is one, to the BACnet dissector.
- * @param tvb
- * @param pinfo
- * @param tree
- * @param subtree
- * @param offset
- * @return none
+ * @param tvb the tv buffer of the current data
+ * @param pinfo the packet info of the current data
+ * @param tree the tree to append this item to
+ * @param subtree the sub tree to append this item to
+ * @param offset the offset in the tvb
  */
 void
 dissect_mstp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_tree *subtree, gint offset);