of: dynamic: Fix use after free in of_changeset_add_prop_helper()

of: dynamic: Fix use after free in of_changeset_add_prop_helper()

[ Upstream commit 80af3745ca465c6c47e833c1902004a7fa944f37 ]

If the of_changeset_add_property() function call fails, then this code
frees "new_pp" and then dereference it on the next line.  Return the
error code directly instead.

Fixes: c81f6ce16785 ("of: dynamic: Fix memleak when of_pci_add_properties() failed")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/aKgljjhnpa4lVpdx@stanley.mountain
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>