pstore: Use zlib_inflateInit2 instead of zlib_inflateInit

Since zlib_deflateInit2() is used for specifying window bit during compression,
zlib_inflateInit2() is appropriate for decompression.
Reported-by: Seiji Aguchi <seiji.aguchi@hds.com>
Tested-by: Seiji Aguchi <seiji.aguchi@hds.com>
Signed-off-by: Aruna Balakrishnaiah <aruna@linux.vnet.ibm.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

fs/pstore/platform.c

@@ -168,7 +168,7 @@ static int pstore_decompress(void *in, void *out, size_t inlen, size_t outlen)
 	int err, ret;
 
 	ret = -EIO;
-	err = zlib_inflateInit(&stream);
+	err = zlib_inflateInit2(&stream, WINDOW_BITS);
 	if (err != Z_OK)
 		goto error;