Fixed crash if initialization of EGL failed but was tried again later.

The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly
uninitialized data structure if loading the library first failed. A later try to
use EGL then skipped initialization and assumed it was previously successful
because the data structure now already existed. This led to at least one crash
in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was
dereferenced to make a call to eglBindAPI().

src/haptic/windows/SDL_windowshaptic_c.h

@@ -0,0 +1,88 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifndef _SDL_windowshaptic_c_h
+#define _SDL_windowshaptic_c_h
+
+#include "SDL_thread.h"
+#include "../SDL_syshaptic.h"
+#include "../../core/windows/SDL_directx.h"
+#include "../../core/windows/SDL_xinput.h"
+
+/*
+ * Haptic system hardware data.
+ */
+struct haptic_hwdata
+{
+#if SDL_HAPTIC_DINPUT
+    LPDIRECTINPUTDEVICE8 device;
+#endif
+    DWORD axes[3];              /* Axes to use. */
+    SDL_bool is_joystick;       /* Device is loaded as joystick. */
+    Uint8 bXInputHaptic; /* Supports force feedback via XInput. */
+    Uint8 userid; /* XInput userid index for this joystick */
+    SDL_Thread *thread;
+    SDL_mutex *mutex;
+    volatile Uint32 stopTicks;
+    volatile int stopThread;
+};
+
+
+/*
+ * Haptic system effect data.
+ */
+struct haptic_hweffect
+{
+#if SDL_HAPTIC_DINPUT
+    DIEFFECT effect;
+    LPDIRECTINPUTEFFECT ref;
+#endif
+#if SDL_HAPTIC_XINPUT
+    XINPUT_VIBRATION vibration;
+#endif
+};
+
+/*
+* List of available haptic devices.
+*/
+typedef struct SDL_hapticlist_item
+{
+    char *name;
+    SDL_Haptic *haptic;
+#if SDL_HAPTIC_DINPUT
+    DIDEVICEINSTANCE instance;
+    DIDEVCAPS capabilities;
+#endif
+    SDL_bool bXInputHaptic; /* Supports force feedback via XInput. */
+    Uint8 userid; /* XInput userid index for this joystick */
+    struct SDL_hapticlist_item *next;
+} SDL_hapticlist_item;
+
+extern SDL_hapticlist_item *SDL_hapticlist;
+
+extern int SDL_SYS_AddHapticDevice(SDL_hapticlist_item *item);
+extern int SDL_SYS_RemoveHapticDevice(SDL_hapticlist_item *prev, SDL_hapticlist_item *item);
+
+#endif /* _SDL_windowshaptic_c_h */
+
+/* vi: set ts=4 sw=4 expandtab: */
+