spi: dw: Drop empty line from DebugFS init function

Just drop a redundant empty line from the dw_spi_debugfs_init() function
left in the framework of the commit 0178f1e5 ("spi-dw-core.c: Fix
error checking for debugfs_create_dir") after removing the last return
statement.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Link: https://lore.kernel.org/r/20230530221725.26319-1-Sergey.Semin@baikalelectronics.ru


Signed-off-by: Mark Brown <broonie@kernel.org>