Lennart Poettering
1c248d7fb7
This is a follow-up for 945a8210c7 and
makes the st_dev check generic, so that we can reuse it some other
places. It also incorporates the non-NULL check now, to be a
comprehensive one-stop solution.
The helper is static inline so that compilers can optimize the redundant
checks away in case it is combined with other checks.
System and Service Manager
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