[hackers] [sic] fix an out-of-bounds read if the input is "" || Hiltjo Posthuma

[git]

commit df4c0611366bf361fa263fbc57009cbe68456855
Author:     Hiltjo Posthuma <hil...@codemadness.org>
AuthorDate: Thu May 6 01:04:35 2021 +0200
Commit:     Hiltjo Posthuma <hil...@codemadness.org>
CommitDate: Thu May 6 01:04:35 2021 +0200

    fix an out-of-bounds read if the input is ""
    
    Notified by Guilherme Janczak <guilherme.janc...@yandex.com>, thanks!

diff --git a/util.c b/util.c
index bdba718..2567812 100644
--- a/util.c
+++ b/util.c
@@ -61,7 +61,7 @@ trim(char *s) {
        char *e;
 
        e = s + strlen(s) - 1;
-       while(isspace(*e) && e > s)
+       while(e > s && isspace(*e))
                e--;
        *(e + 1) = '\0';
 }