nir: Initialize lower_flrp_progress everywhere

Merged Ian Romanick requested to merge idr/mesa:review/CID-Coverity-444989 into master

I don't know why I thought NIR_PASS always set the progress variable. Derp.

Fixes: d41cdef2 ("nir: Use the flrp lowering pass instead of nir_opt_algebraic")
Coverity CID: 1444996
Coverity CID: 1444995
Coverity CID: 1444994
Coverity CID: 1444993
Coverity CID: 1444991
Coverity CID: 1444989

Edited by Ian Romanick

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