MIGRATE: Remove upfront ttl initialization.
MIGRATE: Remove upfront ttl initialization.

After the fix for #3673 the ttl var is always initialized inside the
loop itself, so the early initialization is not needed.

Variables declaration also moved to a more local scope.

pedigree/redis,pedigree/redis,xuguruogu/redis,pedigree/redis,xuguruogu/redis,xuguruogu/redis,xuguruogu/redis,pedigree/redis