http: refuse to pass on response body with NO_NODY was set

... like when a HTTP/0.9 response comes back without any headers at all
and just a body this now prevents that body from being sent to the
callback etc.

Adapted test 1144 to verify.

Fixes #973

Assisted-by: Ray Satiro

lib/transfer.c

@@ -535,6 +535,13 @@ static CURLcode readwrite_data(struct Curl_easy *data,
        is non-headers. */
     if(k->str && !k->header && (nread > 0 || is_empty_data)) {
 
+      if(data->set.opt_no_body) {
+        /* data arrives although we want none, bail out */
+        streamclose(conn, "ignoring body");
+        *done = TRUE;
+        return CURLE_WEIRD_SERVER_REPLY;
+      }
+
 #ifndef CURL_DISABLE_HTTP
       if(0 == k->bodywrites && !is_empty_data) {
         /* These checks are only made the first time we are about to

tests/data/test1144

@@ -30,6 +30,10 @@ data to
 
 verify
 </data>
+# make sure no data is written
+<datacheck nonewline="yes">
+
+</datacheck>
 </reply>
 
 #
@@ -58,5 +62,8 @@ Host: %HOSTIP:%HTTPPORT
 Accept: */*
 
 </protocol>
+<errorcode>
+8
+</errorcode>
 </verify>
 </testcase>