msm: ipa3: fix DMA memory allocation success check

IPA allocates memory for Filtering and Routing tables
by the DMA memory allocation Linux APIs.
The code did not check the success of allocation
correctly. This change fixes the check.

CRs-fixed: 2014060
Change-Id: I95a170f19e3becfc2b90bf5931947c0637464257
Signed-off-by: Ghanim Fodi <gfodi@codeaurora.org>