crypto: lz4 - fixed decompress function to return error code

Decompress function in LZ4 library is supposed to return an error code or
negative result. But, it returns -1 when any error is detected. Return
error code when the library returns negative value.
Signed-off-by: NMyungho Jung <mhjungk@gmail.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

crypto/lz4.c

@@ -97,7 +97,7 @@ static int __lz4_decompress_crypto(const u8 *src, unsigned int slen,
 	int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
 
 	if (out_len < 0)
-		return out_len;
+		return -EINVAL;
 
 	*dlen = out_len;
 	return 0;

crypto/lz4hc.c

@@ -98,7 +98,7 @@ static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
 	int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
 
 	if (out_len < 0)
-		return out_len;
+		return -EINVAL;
 
 	*dlen = out_len;
 	return 0;