Removed/moved unused vars

Relates to issue #230
diff --git a/encoder/basisu_enc.cpp b/encoder/basisu_enc.cpp
index f02fb62..d0c37b0 100644
--- a/encoder/basisu_enc.cpp
+++ b/encoder/basisu_enc.cpp
@@ -1779,8 +1779,6 @@
 			return nullptr;
 		}
 
-		const uint32_t bytes_per_line = hdr.m_width * tga_bytes_per_pixel;
-
 		const uint8_t *pSrc = pBuf + sizeof(tga_header);
 		uint32_t bytes_remaining = buf_size - sizeof(tga_header);
 
diff --git a/transcoder/basisu_transcoder.cpp b/transcoder/basisu_transcoder.cpp
index 29eb3c0..0b37333 100644
--- a/transcoder/basisu_transcoder.cpp
+++ b/transcoder/basisu_transcoder.cpp
@@ -10778,8 +10778,6 @@
 			return false;
 		}
 
-		const bool transcode_alpha_data_to_opaque_formats = (decode_flags & cDecodeFlagsTranscodeAlphaDataToOpaqueFormats) != 0;
-
 		if (decode_flags & cDecodeFlagsPVRTCDecodeToNextPow2)
 		{
 			BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: cDecodeFlagsPVRTCDecodeToNextPow2 currently unsupported\n");
@@ -17336,7 +17334,6 @@
 		
 	bool ktx2_transcoder::decompress_level_data(uint32_t level_index, basisu::uint8_vec& uncomp_data)
 	{
-		const uint8_t* pComp_data = m_levels[level_index].m_byte_offset + m_pData;
 		const uint64_t comp_size = m_levels[level_index].m_byte_length;
 		
 		const uint64_t uncomp_size = m_levels[level_index].m_uncompressed_byte_length;
@@ -17361,6 +17358,7 @@
 		if (m_header.m_supercompression_scheme == KTX2_SS_ZSTANDARD)
 		{
 #if BASISD_SUPPORT_KTX2_ZSTD
+			const uint8_t* pComp_data = m_levels[level_index].m_byte_offset + m_pData;
 			size_t actualUncompSize = ZSTD_decompress(uncomp_data.data(), (size_t)uncomp_size, pComp_data, (size_t)comp_size);
 			if (ZSTD_isError(actualUncompSize))
 			{