os/ObjectStore.cc: don't fallthrough after OP_OMAP_RMKEYRANGE

CID 1054829 (#1 of 1): Missing break in switch (MISSING_BREAK)
  unterminated_case: This case (value 37) is not terminated by a
  'break' statement.

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
rgw/rgw_metadata.cc: fix possible null dereferencing

CID 1054827 (#1 of 1): Dereference after null check (FORWARD_NULL)
  var_deref_model: Passing null pointer "objv_tracker->read_version"
  to function "obj_version::operator =(obj_version const &)", which
  dereferences it.

Moved affected 2 cases into the block checking for objv_tracker

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>