shader/decode/texture: Remove unused variable

This isn't used anywhere, so we can get rid of it.

src/video_core/shader/decode/texture.cpp

@@ -541,7 +541,6 @@ Node4 ShaderIR::GetTld4Code(Instruction instr, TextureType texture_type, bool de
                             bool is_array, bool is_aoffi) {
     const std::size_t coord_count = GetCoordCount(texture_type);
     const std::size_t total_coord_count = coord_count + (is_array ? 1 : 0);
-    const std::size_t total_reg_count = total_coord_count + (depth_compare ? 1 : 0);
 
     // If enabled arrays index is always stored in the gpr8 field
     const u64 array_register = instr.gpr8.Value();