Fixed some issues found with static analysis

test/checkkeys.c

@@ -561,10 +561,12 @@ int main(int argc, char *argv[])
 #endif
 
 done:
-    for (i = 0; i < state->num_windows; ++i) {
-        SDLTest_TextWindowDestroy(windowstates[i].textwindow);
+    if (windowstates) {
+        for (i = 0; i < state->num_windows; ++i) {
+            SDLTest_TextWindowDestroy(windowstates[i].textwindow);
+        }
+        SDL_free(windowstates);
     }
-    SDL_free(windowstates);
     SDLTest_CleanupTextDrawing();
     SDLTest_CommonQuit(state);
     return 0;

test/testautomation_stdlib.c

@@ -378,7 +378,7 @@ static int stdlib_swprintf(void *arg)
     const wchar_t *expected;
     size_t size;
 
-    result = SDL_swprintf(text, sizeof(text), L"%s", "foo");
+    result = SDL_swprintf(text, SDL_arraysize(text), L"%s", "foo");
     expected = L"foo";
     SDLTest_AssertPass("Call to SDL_swprintf(\"%%s\", \"foo\")");
     SDLTest_AssertCheck(SDL_wcscmp(text, expected) == 0, "Check text, expected: %S, got: %S", expected, text);