Remove unnecessary return statements

src/openrct2/drawing/Sprite.cpp

@@ -443,7 +443,6 @@ extern "C"
             dest_pointer = next_dest_pointer;
             source_pointer = next_source_pointer;
         }
-        return;
     }
 
     uint8* FASTCALL gfx_draw_sprite_get_palette(sint32 image_id, uint32 tertiary_colour) {

src/openrct2/drawing/line.c

@@ -141,5 +141,4 @@ void gfx_draw_line_software(rct_drawpixelinfo *dpi, sint32 x1, sint32 y1, sint32
             gfx_draw_line_on_buffer(dpi, colour, y, x_start, no_pixels);
         }
     }
-    return;
 }

src/openrct2/ride/transport/MiniatureRailway.cpp

@@ -1779,7 +1779,6 @@ static void miniature_railway_track_diag_25_deg_up(paint_session * session, uint
 
     paint_util_set_segment_support_height(session, SEGMENTS_ALL, 0xFFFF, 0);
     paint_util_set_general_support_height(session, height + 56, 0x20);
-    return;
 }
 
 /** rct2: 0x008AD210 */

src/openrct2/world/map.c

@@ -1009,7 +1009,6 @@ void game_command_remove_large_scenery(sint32* eax, sint32* ebx, sint32* ecx, si
         calculate_cost == false){
         *ebx = 0;
     }
-    return;
 }
 
 /**