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This adds some missing error reporting for SDL_SelectRenderer, and cleans up the logic a little bit.

Index: SDL_video.c
===================================================================
--- SDL_video.c	(revision 4599)
+++ SDL_video.c	(working copy)
@@ -1522,11 +1522,16 @@
     SDL_Window *window = SDL_GetWindowFromID(windowID);
     SDL_Renderer *renderer;
 
-    if (!window || !window->renderer) {
+	if (!window) {
+		SDL_SetError("Window doesn't exist.");
+		return -1;
+	}
+    renderer = window->renderer;
+	if (!renderer) {
+		SDL_SetError("Renderer has't been created.");
         return -1;
     }
-    renderer = window->renderer;
-    if (renderer && renderer->ActivateRenderer) {
+    if (renderer->ActivateRenderer) {
         if (renderer->ActivateRenderer(renderer) < 0) {
             return -1;
         }