diff -r 9a88920b15d8 -r b0ce8b27978b dav/db.c
--- a/dav/db.c	Fri Apr 12 11:13:16 2019 +0200
+++ b/dav/db.c	Fri Apr 12 12:42:41 2019 +0200
@@ -672,7 +672,7 @@
     free(res);
 }
 
-char* nullstrdup(const char *s) {
+static char* nullstrdup(const char *s) {
     return s ? strdup(s) : NULL;
 }