apparmor: remove unneeded #ifdef in decompress_zstd()

The whole function is guarded by CONFIG_SECURITY_APPARMOR_EXPORT_BINARY,
so the #ifdef here is redundant, remove it.
Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>

security/apparmor/apparmorfs.c

@@ -1314,7 +1314,6 @@ SEQ_RAWDATA_FOPS(compressed_size);
 
 static int decompress_zstd(char *src, size_t slen, char *dst, size_t dlen)
 {
-#ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
 	if (slen < dlen) {
 		const size_t wksp_len = zstd_dctx_workspace_bound();
 		zstd_dctx *ctx;
@@ -1341,7 +1340,6 @@ static int decompress_zstd(char *src, size_t slen, char *dst, size_t dlen)
 		kvfree(wksp);
 		return ret;
 	}
-#endif
 
 	if (dlen < slen)
 		return -EINVAL;