Convert recently-introduced header files to #pragma once
diff --git a/include/osmocom/core/macaddr.h b/include/osmocom/core/macaddr.h
index 3a4e67f..8de6238 100644
--- a/include/osmocom/core/macaddr.h
+++ b/include/osmocom/core/macaddr.h
@@ -1,7 +1,4 @@
-#ifndef _OSMO_MACADDR_H
-#define _OSMO_MACADDR_H
+#pragma once
 
 int osmo_macaddr_parse(uint8_t *out, const char *in);
 int osmo_get_macaddr(uint8_t *mac_out, const char *dev_name);
-
-#endif