If only a partial file was transfered, we consider that a fatal problem so

we won't try to QUIT the control connection and risk "hanging" waiting for
a response. Test case 161 verifies this. The quit-sending function was
also made static.

tests/data/test161

@@ -0,0 +1,39 @@
+# Server-side
+<reply>
+<data>
+1oooooooooooooooooooooooooooooooooooooooooo2
+</data>
+<size>
+10928
+</size>
+</reply>
+
+# Client-side
+<client>
+<server>
+ftp
+</server>
+ <name>
+FTP RETR PASV
+ </name>
+ <command>
+ftp://%HOSTIP:%FTPPORT/161
+</command>
+</test>
+
+
+# Verify data after the test has been "shot"
+<verify>
+<protocol>
+USER anonymous
+PASS curl_by_daniel@haxx.se
+PWD
+EPSV
+TYPE I
+SIZE 161
+RETR 161
+</protocol>
+<errorcode>
+18
+</errrorcode>
+</verify>