msm: ipa: fix memory leaks

Memory was being leaked when adding a routing rule to a table
that already existed. Memory was being leaked when messages
were being sent from WLAN kernel client to IPACM daemon. This
change plugs those leaks.

Change-Id: I88b28837e16bc315052d7d623e8267bf077eabce
Signed-off-by: Ravi Gummadidala <rgummadi@codeaurora.org>