lib/slre: remove superfluous assignment

It makes no sense to assign a value to 'res' if the next use of the
variable is an assignment.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/slre.c b/lib/slre.c
index e26d344..969c46a 100644
--- a/lib/slre.c
+++ b/lib/slre.c
@@ -703,8 +703,6 @@
 
 		(void) memset(caps, 0, sizeof(caps));
 
-		res = 0;
-
 		res = slre_match(&slre, data, len, caps);
 		printf("Result [%d]: %d\n", i, res);