iio: adc: ad7768-1: Fix insufficient alignment of timestamp.

[ Upstream commit ffbc26bc91c1f1eb3dcf5d8776e74cbae21ee13a ]

On architectures where an s64 is not 64-bit aligned, this may result
insufficient alignment of the timestamp and the structure being too small.
Use aligned_s64 to force the alignment.

Fixes: a1caeeb ("iio: adc: ad7768-1: Fix too small buffer passed to iio_push_to_buffers_with_timestamp()") # aligned_s64 newer
Reported-by: David Lechner <[email protected]>
Reviewed-by: Nuno Sá <[email protected]>
Reviewed-by: David Lechner <[email protected]>
Link: https://patch.msgid.link/[email protected]
Cc: <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
(cherry picked from commit 7b16d3c36123f88125493886e1ac58bf2ba59234)
Signed-off-by: Jack Vogel <[email protected]>

Author: jic23

drivers/iio/adc/ad7768-1.c

@@ -169,7 +169,7 @@ struct ad7768_state {
 	union {
 		struct {
 			__be32 chan;
-			s64 timestamp;
+			aligned_s64 timestamp;
 		} scan;
 		__be32 d32;
 		u8 d8[2];