scsi: hptiop: Replace one-element array with flexible-array member in struct hpt_iop_request_ioctl_command()

One-element arrays are deprecated, and we are replacing them with flexible
array members instead. So, replace one-element array with flexible-array
member in struct hpt_iop_request_ioctl_command.

Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/205
Link: https://lore.kernel.org/r/YyyUvuId7dAZadej@work
Reviewed-by: Kees Cook <[e-mail]>
Signed-off-by: Gustavo A. R. Silva <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/hptiop.h

···
 	__le32 inbuf_size;
 	__le32 outbuf_size;
 	__le32 bytes_returned;
-	u8     buf[1];
+	u8     buf[];
 	/* out data should be put at buf[(inbuf_size+3)&~3] */
 };