lib/decompress: set the compressor name to NULL on error
Without this we end up using the previous name of the compressor in the loop in unpack_rootfs. For example we get errors like "compression method gzip not configured" even when we have CONFIG_DECOMPRESS_GZIP enabled. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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