ssa.c: Removed some unneeded checks for not NULL before calling ssa_db_destroy

ssa_db_destroy checks for NULL and if so, immediately returns

Signed-off-by: Hal Rosenstock <hal@mellanox.com>
ssa.c: In ssa_calculate_prdb, change prdb_epoch increment code style

Signed-off-by: Hal Rosenstock <hal@mellanox.com>
ssa.c: In ssa_calculate_prdb, move creation of prdb_copy into existing success case

Signed-off-by: Hal Rosenstock <hal@mellanox.com>
ssa.c: In ssa_calculate_prdb, log warning message when creating PRDB copy fails

Signed-off-by: Hal Rosenstock <hal@mellanox.com>