Fixed crash when dynamic X11 fails to load system Xlib libraries at runtime.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401174

src/video/x11/SDL_x11dyn.c

@@ -104,11 +104,10 @@ int SDL_X11_LoadSymbols(void)
 		#ifdef X11_DYNAMIC
 			x11_handle = SDL_LoadObject(x11_library);
 			x11ext_handle = SDL_LoadObject(x11ext_library);
-			if ((x11_handle != NULL) && (x11ext_handle != NULL)) {
+			rc = ((x11_handle != NULL) && (x11ext_handle != NULL));
 			#define SDL_X11_SYM(r,fn,arg) p##fn = X11_GetSym(#fn, &rc);
 			#include "SDL_x11sym.h"
 			#undef SDL_X11_SYM
-			}
 
 			if (!rc)
 				SDL_X11_UnloadSymbols();  /* in case one of these loaded... */