soc: qcom: llcc: Handle a second device without data corruption

[ Upstream commit f1a1bc8775b26345aba2be278118999e7f661d3d ]

Usually there is only one llcc device. But if there were a second, even
a failed probe call would modify the global drv_data pointer. So check
if drv_data is valid before overwriting it.

Change-Id: Ie9bcc0686959b0c3bfb740963eed3ba399ed735e
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Fixes: a3134fb0 ("drivers: soc: Add LLCC driver")
Git-commit: cc1a1dcb
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Link: https://lore.kernel.org/r/20230926083229.2073890-1-u.kleine-koenig@pengutronix.de


Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: kamasali Satyanarayan <quic_kamasali@quicinc.com>