Remove duplicate assignment

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/tests/testutils.c b/tests/testutils.c
index f185133..521f4f1 100644
--- a/tests/testutils.c
+++ b/tests/testutils.c
@@ -144,7 +144,6 @@
 {
 	int len = strlen(s2);
 
-	len = strlen(s2);
 	if (strncmp(s1, s2, len) != 0)
 		return 0;
 	if (s1[len] == '\0')