Codechange: range based for loops instead of C-style for loops

src/spriteloader/sprite_file.cpp

@@ -24,8 +24,8 @@ static uint8_t GetGRFContainerVersion(SpriteFile &file)
 	if (file.ReadWord() == 0) {
 		/* Check for GRF container version 2, which is identified by the bytes
 		 * '47 52 46 82 0D 0A 1A 0A' at the start of the file. */
-		for (uint i = 0; i < lengthof(_grf_cont_v2_sig); i++) {
-			if (file.ReadByte() != _grf_cont_v2_sig[i]) return 0; // Invalid format
+		for (const auto &expected_sig_byte : _grf_cont_v2_sig) {
+			if (file.ReadByte() != expected_sig_byte) return 0; // Invalid format
 		}
 
 		return 2;