rts: Fix leak of file archive handle
rts: Fix leak of file archive handle

Issue discovered by Coverity Scan, CID 43171.

Signed-off-by: Austin Seipp <7ea35d812706d9213868749011af1ed4fa2f6aa0@well-typed.com>
(cherry picked from commit e597f5feb065c075c86715e24bf0ebd341fa8b9e)

lukexi/ghc-7.8-arm64,hferreiro/replay,lukexi/ghc-7.8-arm64,hferreiro/replay,hferreiro/replay,lukexi/ghc-7.8-arm64,hferreiro/replay,lukexi/ghc-7.8-arm64,lukexi/ghc-7.8-arm64,hferreiro/replay,hferreiro/replay,hferreiro/replay