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/main/psp/SDL_psp_main.c

@@ -0,0 +1,70 @@
+/*
+    SDL_psp_main.c, placed in the public domain by Sam Lantinga  3/13/14
+*/
+#include "SDL_config.h"
+
+#ifdef __PSP__
+
+#include "SDL_main.h"
+#include <pspkernel.h>
+#include <pspdebug.h>
+#include <pspsdk.h>
+#include <pspthreadman.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+/* If application's main() is redefined as SDL_main, and libSDLmain is
+   linked, then this file will create the standard exit callback,
+   define the PSP_MODULE_INFO macro, and exit back to the browser when
+   the program is finished.
+
+   You can still override other parameters in your own code if you
+   desire, such as PSP_HEAP_SIZE_KB, PSP_MAIN_THREAD_ATTR,
+   PSP_MAIN_THREAD_STACK_SIZE, etc.
+*/
+
+PSP_MODULE_INFO("SDL App", 0, 1, 1);
+
+int sdl_psp_exit_callback(int arg1, int arg2, void *common)
+{
+    exit(0);
+    return 0;
+}
+
+int sdl_psp_callback_thread(SceSize args, void *argp)
+{
+    int cbid;
+    cbid = sceKernelCreateCallback("Exit Callback",
+                       sdl_psp_exit_callback, NULL);
+    sceKernelRegisterExitCallback(cbid);
+    sceKernelSleepThreadCB();
+    return 0;
+}
+
+int sdl_psp_setup_callbacks(void)
+{
+    int thid = 0;
+    thid = sceKernelCreateThread("update_thread",
+                     sdl_psp_callback_thread, 0x11, 0xFA0, 0, 0);
+    if(thid >= 0)
+        sceKernelStartThread(thid, 0, 0);
+    return thid;
+}
+
+int main(int argc, char *argv[])
+{
+    pspDebugScreenInit();
+    sdl_psp_setup_callbacks();
+
+    /* Register sceKernelExitGame() to be called when we exit */
+    atexit(sceKernelExitGame);
+
+    SDL_SetMainReady();
+
+    (void)SDL_main(argc, argv);
+    return 0;
+}
+
+#endif /* __PSP__ */
+
+/* vi: set ts=4 sw=4 expandtab: */