worktree: fix option descriptions for `prune`

diff --git a/strbuf.h b/strbuf.h
index 1ea9d0bdeb0980dcaa8670aa43e4ff703fd9d6b8..4a48c0031a7c0df6a7efdb2151d5701dd256fa28 100644 (file)
--- a/strbuf.h
+++ b/strbuf.h
@@ -205,7 +205,8 @@ extern int strbuf_cmp(const struct strbuf *, const struct strbuf *);
  */
 static inline void strbuf_addch(struct strbuf *sb, int c)
 {
-       strbuf_grow(sb, 1);
+       if (!strbuf_avail(sb))
+               strbuf_grow(sb, 1);
        sb->buf[sb->len++] = c;
        sb->buf[sb->len] = '\0';
 }