Save an entire CPU cycle if c points to NULL already.

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1725 f882894a-f735-0410-b71e-b25c423dba1c

plugins/sslutils.c

@@ -70,8 +70,10 @@ void np_net_ssl_cleanup (){
 		if(s){
 				SSL_shutdown (s);
 				SSL_free (s);
-				if(c) SSL_CTX_free (c);
-				c=NULL;
+				if(c) {
+					SSL_CTX_free (c);
+					c=NULL;
+				}
 				s=NULL;
 		}
 }