COMP_zlib should always be declared, even if it is not functional.

Don't dump core in ssltest.
diff --git a/ssl/ssltest.c b/ssl/ssltest.c
index 1e68534..77ac362 100644
--- a/ssl/ssltest.c
+++ b/ssl/ssltest.c
@@ -229,7 +229,7 @@
 	int print_time = 0;
 	clock_t s_time = 0, c_time = 0;
 	int comp = 0;
-	COMP_METHOD *cm;
+	COMP_METHOD *cm = NULL;
 
 	verbose = 0;
 	debug = 0;