[PATCH v1] examples/l3fwd: fix for coverity scan

[Walsh, Conor]

> This patch fixes (Logically dead code) coverity issue.
> This patch also fixes (Uninitialized scalar variable) coverity issue.
> 
> Coverity issue: 381687
> Coverity issue: 381686
> Fixes: 6a094e328598 ("examples/l3fwd: implement FIB lookup method")
> 
> Signed-off-by: Mohammad Iqbal Ahmad <mahmad at marvell.com>

Acked-by: Conor Walsh <conor.walsh at intel.com>