Fix missing whitespace in surface extension missing error messages

src/video/android/SDL_androidvulkan.c

@@ -91,7 +91,7 @@ bool Android_Vulkan_LoadLibrary(SDL_VideoDevice *_this, const char *path)
         SDL_SetError("Installed Vulkan doesn't implement the " VK_KHR_SURFACE_EXTENSION_NAME " extension");
         goto fail;
     } else if (!hasAndroidSurfaceExtension) {
-        SDL_SetError("Installed Vulkan doesn't implement the " VK_KHR_ANDROID_SURFACE_EXTENSION_NAME "extension");
+        SDL_SetError("Installed Vulkan doesn't implement the " VK_KHR_ANDROID_SURFACE_EXTENSION_NAME " extension");
         goto fail;
     }
     return true;

src/video/kmsdrm/SDL_kmsdrmvulkan.c

@@ -117,7 +117,7 @@ bool KMSDRM_Vulkan_LoadLibrary(SDL_VideoDevice *_this, const char *path)
         SDL_SetError("Installed Vulkan doesn't implement the " VK_KHR_SURFACE_EXTENSION_NAME " extension");
         goto fail;
     } else if (!hasDisplayExtension) {
-        SDL_SetError("Installed Vulkan doesn't implement the " VK_KHR_DISPLAY_EXTENSION_NAME "extension");
+        SDL_SetError("Installed Vulkan doesn't implement the " VK_KHR_DISPLAY_EXTENSION_NAME " extension");
         goto fail;
     }
 

src/video/vivante/SDL_vivantevulkan.c

@@ -98,7 +98,7 @@ bool VIVANTE_Vulkan_LoadLibrary(SDL_VideoDevice *_this, const char *path)
         SDL_SetError("Installed Vulkan doesn't implement the " VK_KHR_SURFACE_EXTENSION_NAME " extension");
         goto fail;
     } else if (!hasDisplayExtension) {
-        SDL_SetError("Installed Vulkan doesn't implement the " VK_KHR_DISPLAY_EXTENSION_NAME "extension");
+        SDL_SetError("Installed Vulkan doesn't implement the " VK_KHR_DISPLAY_EXTENSION_NAME " extension");
         goto fail;
     }
     return true;

src/video/wayland/SDL_waylandvulkan.c

@@ -103,7 +103,7 @@ bool Wayland_Vulkan_LoadLibrary(SDL_VideoDevice *_this, const char *path)
         SDL_SetError("Installed Vulkan doesn't implement the " VK_KHR_SURFACE_EXTENSION_NAME " extension");
         goto fail;
     } else if (!hasWaylandSurfaceExtension) {
-        SDL_SetError("Installed Vulkan doesn't implement the " VK_KHR_WAYLAND_SURFACE_EXTENSION_NAME "extension");
+        SDL_SetError("Installed Vulkan doesn't implement the " VK_KHR_WAYLAND_SURFACE_EXTENSION_NAME " extension");
         goto fail;
     }
     return true;

src/video/windows/SDL_windowsvulkan.c

@@ -91,7 +91,7 @@ bool WIN_Vulkan_LoadLibrary(SDL_VideoDevice *_this, const char *path)
         SDL_SetError("Installed Vulkan doesn't implement the " VK_KHR_SURFACE_EXTENSION_NAME " extension");
         goto fail;
     } else if (!hasWin32SurfaceExtension) {
-        SDL_SetError("Installed Vulkan doesn't implement the " VK_KHR_WIN32_SURFACE_EXTENSION_NAME "extension");
+        SDL_SetError("Installed Vulkan doesn't implement the " VK_KHR_WIN32_SURFACE_EXTENSION_NAME " extension");
         goto fail;
     }
     return true;

src/video/x11/SDL_x11vulkan.c

@@ -120,7 +120,7 @@ bool X11_Vulkan_LoadLibrary(SDL_VideoDevice *_this, const char *path)
     if (hasXlibSurfaceExtension) {
         videoData->vulkan_xlib_xcb_library = NULL;
     } else if (!hasXCBSurfaceExtension) {
-        SDL_SetError("Installed Vulkan doesn't implement either the " VK_KHR_XCB_SURFACE_EXTENSION_NAME "extension or the " VK_KHR_XLIB_SURFACE_EXTENSION_NAME " extension");
+        SDL_SetError("Installed Vulkan doesn't implement either the " VK_KHR_XCB_SURFACE_EXTENSION_NAME " extension or the " VK_KHR_XLIB_SURFACE_EXTENSION_NAME " extension");
         goto fail;
     } else {
         const char *libX11XCBLibraryName = SDL_GetHint(SDL_HINT_X11_XCB_LIBRARY);