fix sdl image loder io leak and send image popup fixes

src/chat_gui/send_image_popup.cpp

@@ -11,6 +11,8 @@
 
 #include <imgui/imgui.h>
 
+#include <cmath>
+
 // fwd
 namespace Message {
 uint64_t getTimeMS(void);
@@ -91,7 +93,7 @@ bool SendImagePopup::load(void) {
 		preview_image.timestamp_last_rendered = Message::getTimeMS();
 		preview_image.current_texture = 0;
 		for (const auto& [ms, data] : original_image.frames) {
-			const auto n_t = _tu.uploadRGBA(data.data(), original_image.width, original_image.height);
+			const auto n_t = _tu.upload(data.data(), original_image.width, original_image.height);
 			preview_image.textures.push_back(n_t);
 			preview_image.frame_duration.push_back(ms);
 		}

src/image_loader_sdl_image.cpp

@@ -55,6 +55,7 @@ ImageLoaderSDLImage::ImageInfo ImageLoaderSDLImage::loadInfoFromMemory(const uin
 	// we ignore tga
 	auto ext_opt = getExt(ios);
 	if (!ext_opt.has_value()) {
+		SDL_CloseIO(ios);
 		return res;
 	}
 
@@ -80,6 +81,7 @@ ImageLoaderSDLImage::ImageResult ImageLoaderSDLImage::loadFromMemoryRGBA(const u
 	// we ignore tga
 	auto ext_opt = getExt(ios);
 	if (!ext_opt.has_value()) {
+		SDL_CloseIO(ios);
 		return res;
 	}