Fixed Visual Studio warning 4701

src/video/SDL_RLEaccel.c

@@ -175,7 +175,7 @@
         Uint8 *src = from;                                       \
         Uint8 *dst = to;                                         \
         for (i = 0; i < (int)(length); i++) {                    \
-            Uint32 s, d;                                         \
+            Uint32 s = 0, d = 0;                                         \
             unsigned rs, gs, bs, rd, gd, bd;                     \
             switch (bpp) {                                       \
             case 2:                                              \

src/video/SDL_vulkan_utils.c

@@ -273,7 +273,7 @@ SDL_bool SDL_Vulkan_Display_CreateSurface(void *vkGetInstanceProcAddr_,
         VkDisplayKHR display;
         VkDisplayPlanePropertiesKHR *displayPlaneProperties = NULL;
         VkExtent2D extent;
-        VkDisplayPlaneCapabilitiesKHR planeCaps;
+        VkDisplayPlaneCapabilitiesKHR planeCaps = { 0 };
 
         /* Get information about the physical displays */
         result = vkGetPhysicalDeviceDisplayPropertiesKHR(physicalDevice, &displayPropertiesCount, NULL);