staging: sm750fb: remove defintion of offsetof

There is no need to redefine offsetof
Signed-off-by: Mike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/sm750fb/sm750.h

@@ -155,10 +155,6 @@ struct lynxfb_par {
 	struct lynx_share *share;
 };
 
-#ifndef offsetof
-#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
-#endif
-
 static inline unsigned long ps_to_hz(unsigned int psvalue)
 {
 	unsigned long long numerator = 1000*1000*1000*1000ULL;