The controller reference count is not decremented on registration
failures (and has not been for a very long time) contrary to what the
outdated kernel-doc says.

Drop the entire sentence about return values which are now documented in
the Return section.

Fixes: b885244eb262 ("[PATCH] spi: add spi_driver to SPI framework")
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/spi/spi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index bfc42b75549a..34aca18a96d8 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -3388,8 +3388,8 @@ static int spi_controller_id_alloc(struct spi_controller *ctlr, int start, int e
  * device identification, boards need configuration tables telling which
  * chip is at which address.
  *
- * This must be called from context that can sleep.  It returns zero on
- * success, else a negative error code (dropping the controller's refcount).
+ * This must be called from context that can sleep.
+ *
  * After a successful return, the caller is responsible for calling
  * spi_unregister_controller().
  *
-- 
2.52.0