[Rpm-maint] [rpm-software-management/rpm] Add an error message when rpm fails to open a pipe for shell expansion (#862)

[Panu Matilainen]

Right, I noticed but forgot to mention setting mb->error becoming redundant, thanks.

As for the error message, if you grep around a bit you'll notice that the common pattern for these things is:

<error message>:<what>:<why>

...where <what> is a file name or similar, and in this case it'd be the macro, and <why> is the strerror(errno) / %m. It might actually be the unexpanded macro that makes it easier to trace the origin, but not sure about that.

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