include: Switch to #pragma once pattern

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/include/osmocom/vty/logging.h b/include/osmocom/vty/logging.h
index e0011bf..9e4b98f 100644
--- a/include/osmocom/vty/logging.h
+++ b/include/osmocom/vty/logging.h
@@ -1,5 +1,4 @@
-#ifndef _VTY_LOGGING_H
-#define _VTY_LOGGING_H
+#pragma once
 
 #define LOGGING_STR	"Configure log message to this terminal\n"
 #define FILTER_STR	"Filter log messages\n"
@@ -8,5 +7,3 @@
 void logging_vty_add_cmds(const struct log_info *cat);
 struct vty;
 struct log_target *osmo_log_vty2tgt(struct vty *vty);
-
-#endif /* _VTY_LOGGING_H */