OpenGL ES build fix.

src/Plugins/TgaImporter/TgaImporter.cpp

@@ -137,12 +137,12 @@ ImageData2D* TgaImporter::doImage2D(UnsignedInt) {
 
     #ifdef MAGNUM_TARGET_GLES
     if(format == ImageFormat::RGB) {
-        auto data = reinterpret_cast<Math::Vector3<UnsignedByte>*>(buffer);
-        std::transform(data, data + dimensions.product(), data,
+        auto pixels = reinterpret_cast<Math::Vector3<UnsignedByte>*>(data);
+        std::transform(pixels, pixels + size.product(), pixels,
             [](Math::Vector3<UnsignedByte> pixel) { return swizzle<'b', 'g', 'r'>(pixel); });
     } else if(format == ImageFormat::RGBA) {
-        auto data = reinterpret_cast<Math::Vector4<UnsignedByte>*>(buffer);
-        std::transform(data, data + dimensions.product(), data,
+        auto pixels = reinterpret_cast<Math::Vector4<UnsignedByte>*>(data);
+        std::transform(pixels, pixels + size.product(), pixels,
             [](Math::Vector4<UnsignedByte> pixel) { return swizzle<'b', 'g', 'r', 'a'>(pixel); });
     }
     #endif