spi: pic32: Don't leak DMA channels in probe error path

stable inclusion
from stable-5.10.4
commit cc5a0cb114501f6be33e879afc75f7032572a196
bugzilla: 46903

--------------------------------

commit c575e911 upstream.

If the calls to devm_request_irq() or devm_spi_register_master() fail
on probe of the PIC32 SPI driver, the DMA channels requested by
pic32_spi_dma_prep() are erroneously not released.  Plug the leak.

Fixes: 1bcb9f8c ("spi: spi-pic32: Add PIC32 SPI master driver")
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: <stable@vger.kernel.org> # v4.7+
Cc: Purna Chandra Mandal <purna.mandal@microchip.com>
Link: https://lore.kernel.org/r/9624250e3a7aa61274b38219a62375bac1def637.1604874488.git.lukas@wunner.de


Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Chen Jun <chenjun102@huawei.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>