dma-buf: fix compare in WARN_ON_ONCE

Smatch pointed out this trivial typo:
	drivers/dma-buf/dma-buf.c:1123 dma_buf_map_attachment()
	warn: passing positive error code '16' to 'ERR_PTR'

drivers/dma-buf/dma-buf.c
    1113         dma_resv_assert_held(attach->dmabuf->resv);
    1114
    1115         if (dma_buf_pin_on_map(attach)) {
    1116                 ret = attach->dmabuf->ops->pin(attach);
    1117                 /*
    1118                  * Catch exporters making buffers inaccessible even when
    1119                  * attachments preventing that exist.
    1120                  */
    1121                 WARN_ON_ONCE(ret == EBUSY);
                                             ^^^^^
This was probably intended to be -EBUSY?

    1122                 if (ret)
--> 1123                         return ERR_PTR(ret);
                                                ^^^
Otherwise we will eventually crash.

    1124         }
    1125
    1126         sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction);
    1127         if (!sg_table)
    1128                 sg_table = ERR_PTR(-ENOMEM);
    1129         if (IS_ERR(sg_table))
    1130                 goto error_unpin;
    1131

Signed-off-by: Christian König <[email protected]>
Reviewed-by: Tvrtko Ursulin <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: ChristianKoenigAMD

drivers/dma-buf/dma-buf.c

@@ -1118,7 +1118,7 @@ struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach,
 		 * Catch exporters making buffers inaccessible even when
 		 * attachments preventing that exist.
 		 */
-		WARN_ON_ONCE(ret == EBUSY);
+		WARN_ON_ONCE(ret == -EBUSY);
 		if (ret)
 			return ERR_PTR(ret);
 	}