Remove bogus test preprocessor test.

PAGE_SIZE isn't even always defined at this point,
which makes us test undefined preprocessor symbols.

It so happens that the test works in that case,
but since the test is a bit pointless in the first
place...

include/asm-ppc64/thread_info.h

@@ -69,10 +69,6 @@ struct thread_info {
 #define get_thread_info(ti)	get_task_struct((ti)->task)
 #define put_thread_info(ti)	put_task_struct((ti)->task)
 
-#if THREAD_SIZE != (4*PAGE_SIZE)
-#error update vmlinux.lds and current_thread_info to match
-#endif
-
 /* how to get the thread information struct from C */
 static inline struct thread_info *current_thread_info(void)
 {