scsi: ufs: Fix the build for the old ARM OABI

All structs and unions are word aligned when using the OABI. Mark the union
in struct utp_upiu_header as packed to prevent that the compiler inserts
padding bytes.

Cc: Arnd Bergmann <[email protected]>
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Fixes: 617bfaa ("scsi: ufs: Simplify response header parsing")
Signed-off-by: Bart Van Assche <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Arnd Bergmann <[email protected]>
Reviewed-by: Bean Huo <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: bvanassche

include/uapi/scsi/scsi_bsg_ufs.h

@@ -83,7 +83,7 @@ struct utp_upiu_header {
 			union {
 				__u8 tm_function;
 				__u8 query_function;
-			};
+			} __attribute__((packed));
 			__u8 response;
 			__u8 status;
 			__u8 ehs_length;