mmc-utils: move offsetof from mmc.h to only user

offsetof isn't mmc specific, so remove it from mmc.h. As there is only a
single user define it there.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Chris Ball <chris@printf.net>

mmc.h

@@ -19,10 +19,6 @@
 
 #include <linux/mmc/ioctl.h>
 
-#ifndef offsetof
-#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
-#endif
-
 /* From kernel linux/major.h */
 #define MMC_BLOCK_MAJOR			179
 

mmc_cmds.c

@@ -38,6 +38,10 @@
 #include "mmc_cmds.h"
 #include "3rdparty/hmac_sha/hmac_sha2.h"
 
+#ifndef offsetof
+#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+#endif
+
 #define WP_BLKS_PER_QUERY 32
 
 #define USER_WP_PERM_PSWD_DIS	0x80