Clarify code flow in SchemaAwareApplyOperation

When applying merge, we have a fall-through situation on the code.
Eliminate it by introducing a temporary variable. This makes the code a
bit more readable.

Change-Id: I3f468eb1235866ed627acdf5b60e6f890e44188a
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "Clarify code flow in SchemaAwareApplyOperation"