storage_backend.c: assure clang that inputvol can't be NULL
storage_backend.c: assure clang that inputvol can't be NULL

* src/storage_backend.c: Include "internal.h".
(virStorageBackendCopyToFD): Mark inputvol parameter as "nonnull".
Remove test for non-NULL inputvol.  Both callers ensure it's non-NULL.

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