[hackers] [libzahl] Add missing ! || Mattias Andrée

[git]

commit 157c52efce3fce61af6d411584c7ce35e371be07
Author:     Mattias Andrée <maand...@kth.se>
AuthorDate: Fri Jul 29 12:37:41 2016 +0200
Commit:     Mattias Andrée <maand...@kth.se>
CommitDate: Fri Jul 29 12:37:41 2016 +0200

    Add missing !
    
    Signed-off-by: Mattias Andrée <maand...@kth.se>

diff --git a/doc/exercises.tex b/doc/exercises.tex
index 7828cf8..755390e 100644
--- a/doc/exercises.tex
+++ b/doc/exercises.tex
@@ -764,7 +764,7 @@ modtetra(z_t r, z_t b, unsigned long n, z_t m)
     z_t t, temp;
 
     if (n <= 1) \{
-        if (n)
+        if (!n)
             zsetu(r, zcmpu(m, 1));
         else
             zmod(r, b, m);