src/darwin: fix crash while accessing http content while no proxy is set

src/darwin/netconf.c

@@ -46,6 +46,7 @@ char *vlc_getProxyUrl(const char *url)
         CFNumberRef cfn_httpProxyOn =
             (CFNumberRef)CFDictionaryGetValue(proxies,
                                               kSCPropNetProxiesHTTPEnable);
+        if (cfn_httpProxyOn) {
             int i_httpProxyOn;
             CFNumberGetValue(cfn_httpProxyOn, kCFNumberIntType, &i_httpProxyOn);
             CFRelease(cfn_httpProxyOn);
@@ -84,6 +85,7 @@ char *vlc_getProxyUrl(const char *url)
                 }
                 CFRelease(httpProxy);
             }
+        }
         CFRelease(proxies);
     }