bus: remove wrong doxygen for dump function

This trivial patch removes wrong comments about
the return value of the rte_bus_dump(), as
this method does not return any value
(it's return type is void)

Fixes: a97725791eec ("bus: introduce bus abstraction")

Signed-off-by: Rami Rosen <rami.rosen@intel.com>

lib/librte_eal/common/include/rte_bus.h

@@ -230,10 +230,6 @@ int rte_bus_probe(void);
  *
  * @param f
  *	 A valid and open output stream handle
- *
- * @return
- *	 0 in case of success
- *	!0 in case there is error in opening the output stream
  */
 void rte_bus_dump(FILE *f);