llbsolver: avoid nil releaser on error
Signed-off-by: Tonis Tiigi tonistiigi@gmail.com (cherry picked from commit ce9e28281ac498ba7a909efd0494cf0f0b242b73)
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Signed-off-by: Tonis Tiigi tonistiigi@gmail.com (cherry picked from commit ce9e28281ac498ba7a909efd0494cf0f0b242b73)