iommu: arm-smmu: fix KW issues

variable 'err' can be used uninitialized in fast_smmu_errata_init().
Initialize the same.

Change-Id: I7dfe3e41db05e0faf4db9f2a0c4a2ac9a299b2bb
Signed-off-by: Prakash Gupta <guptap@codeaurora.org>
1 file changed