staging/lustre: Remove duplicate helpers from libcfs.h

#include "curproc.h"

#ifndef offsetof

# define offsetof(typ, memb) ((long)(long_ptr_t)((char *)&(((typ *)0)->memb)))

#endif

#ifndef ARRAY_SIZE

#define ARRAY_SIZE(a) ((sizeof(a)) / (sizeof((a)[0])))

#endif

#if !defined(swap)

#define swap(x, y) do { typeof(x) z = x; x = y; y = z; } while (0)

#endif

#if !defined(container_of)

/* given a pointer @ptr to the field @member embedded into type (usually

 * struct) @type, return pointer to the embedding instance of @type. */

#define container_of(ptr, type, member) \

	((type *)((char *)(ptr)-(char *)(&((type *)0)->member)))

#endif

static inline int __is_po2(unsigned long long val)

{

	return !(val & (val - 1));