code cleanup: comment unused members of bmesh operator slots and some osl style edits.

source/blender/bmesh/intern/bmesh_operator_api.h

@@ -119,8 +119,8 @@ typedef struct BMOpSlot {
 	const char *slot_name;  /* pointer to BMOpDefine.slot_args */
 	int slot_type;
 	int len;
-	int flag;
-	int index; /* index within slot array */
+//	int flag;  /* UNUSED */
+//	int index; /* index within slot array */  /* UNUSED */
 	union {
 		int i;
 		float f;

source/blender/bmesh/intern/bmesh_operators.c

@@ -133,7 +133,7 @@ static void bmo_op_slots_init(BMOSlotType *slot_types, BMOpSlot *slot_args)
 	for (i = 0; slot_types[i].type; i++) {
 		slot_args[i].slot_name = slot_types[i].name;
 		slot_args[i].slot_type = slot_types[i].type;
-		slot_args[i].index = i;
+		// slot_args[i].index = i;  // UNUSED
 	}
 }