ring-buffer: Fix bytes_dropped calculation issue

[ Upstream commit c73f0b69648501978e8b3e8fa7eef7f4197d0481 ]

The calculation of bytes-dropped and bytes_dropped_nested is reversed.
Although it does not affect the final calculation of total_dropped,
it should still be modified.

Link: https://lore.kernel.org/[email protected]
Fixes: 6c43e55 ("ring-buffer: Add ring buffer startup selftest")
Signed-off-by: Feng Yang <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
(cherry picked from commit 4a760b682ecb73bc9a09debb58580b0fc81f58f3)
Signed-off-by: Alok Tiwari <[email protected]>

Author: kknjh

kernel/trace/ring_buffer.c

@@ -5141,9 +5141,9 @@ static __init int rb_write_something(struct rb_test_data *data, bool nested)
 		/* Ignore dropped events before test starts. */
 		if (started) {
 			if (nested)
-				data->bytes_dropped += len;
-			else
 				data->bytes_dropped_nested += len;
+			else
+				data->bytes_dropped += len;
 		}
 		return len;
 	}