lib/ftl: removed dead code

Code cleanup: removed duplicated fragment of the code.
The same 'if' check was executed twice, one by one,
without any instructions between.

Change-Id: Iebd9e777138170f3b9b9fd8c8608fcc3444957d9
Signed-off-by: Marcin Spiewak <marcin.spiewak@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/22135


Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>
Reviewed-by: Sebastian Brzezinka <sebastian.brzezinka@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Mateusz Kozlowski <mateusz.kozlowski@solidigm.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>