Put some extra parentheses around some logic, to clarify order of operations.

  Fixes Bugzilla #740.

--HG--
branch : SDL-1.2
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/branches/SDL-1.2%403799

src/video/windx5/SDL_dx5events.c

@@ -295,7 +295,7 @@ static void post_mouse_motion(int relative, Sint16 x, Sint16 y)
 {
 	extern int mouse_relative;
 
-	if ( SDL_GetAppState() & (SDL_APPINPUTFOCUS|SDL_APPMOUSEFOCUS) ==
+	if ( (SDL_GetAppState() & (SDL_APPINPUTFOCUS|SDL_APPMOUSEFOCUS)) ==
 		(SDL_APPINPUTFOCUS|SDL_APPMOUSEFOCUS) ) {
 		posted = SDL_PrivateMouseMotion(
 			0, relative, x, y);