pv-wrap: Don't try to construct a sysroot for a NULL path
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pv-wrap: Don't try to construct a sysroot for a NULL path
The SrtSysroot passes it to a function that is annotated as not validly accepting NULL, which is caught by recent functions of UBSan. In practice _srt_sysroot_new() would have returned NULL in this situation anyway.
Fixes: 1d08d563 "pv-wrap: Use a SrtSysroot to represent the interpreter root"
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SrtSysroot: Add precondition checks