scsi: aacraid: Avoid -Warray-bounds warning

The one-element array in aac_aifcmd is actually meant as a flexible array,
and causes an overflow warning that can be avoided using the normal flex
arrays:

drivers/scsi/aacraid/commsup.c:1166:17: error: array index 1 is past the end of the array (that has type 'u8[1]' (aka 'unsigned char[1]'), cast to '__le32 *' (aka 'unsigned int *')) [-Werror,-Warray-bounds]
                                (((__le32 *)aifcmd->data)[1] == cpu_to_le32(3));
                                            ^             ~
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20230703114851.1194510-1-arnd@kernel.orgSigned-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/aacraid/aacraid.h

@@ -2617,7 +2617,7 @@ struct aac_hba_info {
 struct aac_aifcmd {
 	__le32 command;		/* Tell host what type of notify this is */
 	__le32 seqnum;		/* To allow ordering of reports (if necessary) */
-	u8 data[1];		/* Undefined length (from kernel viewpoint) */
+	u8 data[];		/* Undefined length (from kernel viewpoint) */
 };
 
 /**