[hackers] [tabbed] Fix movetab and focusurgent when there's no client || Caleb Malchik

[git]

commit 6dc3978edf56ef6760ed818e29eb920138b09802
Author:     Caleb Malchik <cmalc...@gmail.com>
AuthorDate: Sun May 7 18:08:37 2017 -0700
Commit:     Quentin Rameau <quinq@fifth.space>
CommitDate: Mon May 8 08:58:45 2017 +0200

    Fix movetab and focusurgent when there's no client
    
    Accessing those would crash with a floating point exception.

diff --git a/tabbed.c b/tabbed.c
index 6321575..ff3ada0 100644
--- a/tabbed.c
+++ b/tabbed.c
@@ -502,6 +502,9 @@ focusurgent(const Arg *arg)
 {
        int c;
 
+       if (sel < 0)
+               return;
+
        for (c = (sel + 1) % nclients; c != sel; c = (c + 1) % nclients) {
                if (clients[c]->urgent) {
                        focus(c);
@@ -785,11 +788,14 @@ movetab(const Arg *arg)
        int c;
        Client *new;
 
+       if (sel < 0)
+               return;
+
        c = (sel + arg->i) % nclients;
        if (c < 0)
                c += nclients;
 
-       if (sel < 0 || c == sel)
+       if (c == sel)
                return;
 
        new = clients[sel];