dma-mapping: fix direction in dma_alloc direction traces

Set __entry->dir to the actual "dir" parameter of all trace events
in dma_alloc_class. This struct member was left uninitialized by
mistake.

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Fixes: 3afff77 ("dma-mapping: trace dma_alloc/free direction")
Cc: stable@vger.kernel.org
Reviewed-by: Sean Anderson <sean.anderson@linux.dev>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20251001061028.412258-1-ptesarik@suse.com

Author: ptesarik

include/trace/events/dma.h

@@ -133,6 +133,7 @@ DECLARE_EVENT_CLASS(dma_alloc_class,
 		__entry->dma_addr = dma_addr;
 		__entry->size = size;
 		__entry->flags = flags;
+		__entry->dir = dir;
 		__entry->attrs = attrs;
 	),