storage: kill dead stores
Found by clang. Clang complained that virStorageBackendProbeTarget could dereference NULL if backingStoreFormat was NULL, but since all callers passed a valid pointer, I added attributes instead of null checks. * src/storage/storage_backend.c (virStorageBackendQEMUImgBackingFormat): Kill dead store. * src/storage/storage_backend_fs.c (virStorageBackendProbeTarget): Likewise. Skip null checks, by adding attributes.
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