21dd1de659
Let's avoid creating another mount in the system if it's empty anyway. This is mostl a cosmetic thing in one (pretty common) special case: if creds settings are used in a unit but no creds actually available to be passed. (While we are at it this also does one more minor optimization: it adjusts the MS_RDONLY/MS_NOSUID/… flags of the source mount we are about to MS_MOVE into the right place only if we actually really move it, and if we instead unmount it again we won't bother with the flags either)
System and Service Manager
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