rs6000: Remove a comma in a debug string

It is a bit confusing, it looks as if the compiler tried to print
something there.


	* config/rs6000/rs6000.c (rs6000_register_move_cost): Fix typo.

From-SVN: r270426

gcc/ChangeLog

+2018-04-17  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* config/rs6000/rs6000.c (rs6000_register_move_cost): Fix typo.
+
 2019-04-17  Hongtao Liu  <hongtao.liu@intel.com>
 
 	PR target/90125

gcc/config/rs6000/rs6000.c

@@ -35023,7 +35023,7 @@ rs6000_register_move_cost (machine_mode mode,
     {
       if (dbg_cost_ctrl == 1)
 	fprintf (stderr,
-		 "rs6000_register_move_cost:, ret=%d, mode=%s, from=%s, to=%s\n",
+		 "rs6000_register_move_cost: ret=%d, mode=%s, from=%s, to=%s\n",
 		 ret, GET_MODE_NAME (mode), reg_class_names[from],
 		 reg_class_names[to]);
       dbg_cost_ctrl--;