Fix -Wsign-compare error in keys.c

Part of https://github.com/gsliepen/tinc/issues/288

diff --git a/src/keys.c b/src/keys.c
index c857fb6..dacb87b 100644 (file)
--- a/src/keys.c
+++ b/src/keys.c
@@ -21,7 +21,7 @@ bool disable_old_keys(const char *filename, const char *what) {
                return false;
        }
 
-       int result = snprintf(tmpfile, sizeof(tmpfile), "%s.tmp", filename);
+       size_t result = snprintf(tmpfile, sizeof(tmpfile), "%s.tmp", filename);
 
        if(result < sizeof(tmpfile)) {
                struct stat st = {.st_mode = 0600};