As suggested here:

http://gcc.gnu.org/ml/gcc-patches/2012-10/msg00283.html

The following are committed as obvious / trivial:
	* config/rs6000/predicates.md (zero_fp_constant): Fix comment.
	* config/rs6000/rs6000.md (return_pred): Fix null return.
	* config/rs6000/rs6000.c (rs6000_emit_set_const): Fix indentation.
	(print_operand): Make FALLTHRU obvious.
	(output_cbranch): Correct comment.

From-SVN: r192373