Fix size_t temporary underflow in log_loaded_themes

`len` will underflow but will overflow right after, so it's not as bad as it
may appear. Still better not to under/overflow at all.

Fixes https://github.com/swaywm/sway/issues/3862

1 files changed, 3 insertions, 3 deletions

diff --git a/swaybar/tray/icon.c b/swaybar/tray/icon.c
index c7ce20b4..2276e36d 100644
--- a/swaybar/tray/icon.c
+++ b/swaybar/tray/icon.c
@@ -307,16 +307,16 @@ static void log_loaded_themes(list_t *themes) {
                 return;
         }
 
-        const char *sep = ", ";
+        const char sep[] = ", ";
         size_t sep_len = strlen(sep);
 
-        size_t len = 1 - sep_len;
+        size_t len = 0;
         for (int i = 0; i < themes->length; ++i) {
                 struct icon_theme *theme = themes->items[i];
                 len += strlen(theme->name) + sep_len;
         }
 
-        char *str = malloc(len);
+        char *str = malloc(len + 1);
         if (!str) {
                 return;
         }