The clean up of struct d can potentiallly index into a null array
d->virt_buf causing errorenous pointer dereferencing issues on
kfree calls. Fix this by adding a null check on d->virt_buf before
attempting to traverse the array to kfree the objects.
Addresses-Coverity: ("Dereference after null check")
Fixes: 4c50144563 ("regmap-irq: Introduce virtual regs to handle more config regs")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20210406164002.430221-1-colin.king@canonical.com
Signed-off-by: Mark Brown <broonie@kernel.org>
14e13b1ce9