Fix some code maintenance issues

Various instances of variables being written to, but then never read.

Reviewed-by: Richard Levitte <levitte@openssl.org>

apps/x509.c

diff --git a/apps/x509.c b/apps/x509.c
index 6e6ee08..6370116 100644
--- a/apps/x509.c
+++ b/apps/x509.c
@@ -763,7 +763,7 @@
                 BIO_printf(out, "/*\n"
                                 " * Subject: %s\n", buf);
 
-                m = X509_NAME_oneline(X509_get_issuer_name(x), buf, sizeof buf);
+                X509_NAME_oneline(X509_get_issuer_name(x), buf, sizeof buf);
                 BIO_printf(out, " * Issuer:  %s\n"
                                 " */\n", buf);