drivers: rmnet_shs: Static analysis fixes

Fixed potential issues found by static analysis.
Fixed Junk trace output

CR-Fixed: 2326419
Change-Id: Icf42f28b8e123e36af522eccef4b1e6aaa0bf001
Acked-by: Raul Martinez <mraul@qti.qualcomm.com>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>