Fixed memory leaks at linux emulator shutdown

platform/drivers/display/display_libSDL.c

@@ -32,7 +32,7 @@
 #include <string.h>
 #include <SDL2/SDL.h>
 
-void *frameBuffer;           /* Pointer to framebuffer */
+void *frameBuffer = NULL;    /* Pointer to framebuffer */
 bool inProgress;             /* Flag to signal when rendering is in progress */
 
 /*
@@ -73,6 +73,7 @@ uint32_t fetchPixelFromFb(unsigned int x, unsigned int y)
 
     pixel = 0xFF000000 | (px << 16) | (px << 8) | px;
     #endif
+
     return pixel;
 }
 
@@ -114,12 +115,11 @@ void display_init()
 
 void display_terminate()
 {
-    while (inProgress)
-    {}         /* Wait until current render finishes */
-    printf("Terminating SDL display emulator, goodbye!\n");
-    free(frameBuffer);
+    while (inProgress){ }         /* Wait until current render finishes */
     chan_close(&fb_sync);
     chan_terminate(&fb_sync);
+    if(frameBuffer != NULL) free(frameBuffer);
+    frameBuffer = NULL;
 }
 
 void display_renderRows(uint8_t startRow, uint8_t endRow)

platform/targets/linux/emulator/sdl_engine.c

@@ -375,6 +375,10 @@ void sdlEngine_run()
         }
     }
 
+    printf("Terminating SDL display emulator, goodbye!\n");
+
+    SDL_DestroyTexture(displayTexture);
+    SDL_DestroyRenderer(renderer);
     SDL_DestroyWindow(window);
     SDL_Quit();
 }

platform/targets/linux/platform.c

@@ -50,8 +50,6 @@ void platform_init()
 void platform_terminate()
 {
     printf("Platform terminate\n");
-    gfx_terminate();
-
     exit(0);
 }