bus/fslmc: handle portal allocation failure
bus/fslmc: handle portal allocation failure

Add the error handling on failure.

Signed-off-by: Nipun Gupta <4871fd67344c57328097f2fd932ad9a0f1f1fe74@nxp.com>
Signed-off-by: Hemant Agrawal <90d96ef1ecd8ed49b97c7897be950e80824a9c5c@nxp.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk