include: Switch to #pragma once pattern

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/include/osmocom/gsm/protocol/ipaccess.h b/include/osmocom/gsm/protocol/ipaccess.h
index 5d98a21..254c2bc 100644
--- a/include/osmocom/gsm/protocol/ipaccess.h
+++ b/include/osmocom/gsm/protocol/ipaccess.h
@@ -1,5 +1,4 @@
-#ifndef _OSMO_PROTO_IPACCESS_H
-#define _OSMO_PROTO_IPACCESS_H
+#pragma once
 
 #include <stdint.h>
 
@@ -90,5 +89,3 @@
 	uint32_t addr2;
 	uint32_t start;
 } __attribute__((packed));
-
-#endif /* _OSMO_PROTO_IPACCESS_H */