CURLU: fix NULL dereference when used over proxy

Test 659 verifies

Also fixed the test 658 name

Closes #3641

tests/data/Makefile.inc

@@ -83,7 +83,7 @@ test617 test618 test619 test620 test621 test622 test623 test624 test625 \
 test626 test627 test628 test629 test630 test631 test632 test633 test634 \
 test635 test636 test637 test638 test639 test640 test641 test642 \
 test643 test644 test645 test646 test647 test648 test649 test650 test651 \
-test652 test653 test654 test655 test656 test658 \
+test652 test653 test654 test655 test656 test658 test659 \
 \
 test700 test701 test702 test703 test704 test705 test706 test707 test708 \
 test709 test710 test711 test712 test713 test714 test715 \

tests/data/test658

@@ -3,6 +3,7 @@
 <keywords>
 HTTP
 HTTP GET
+CURLOPT_CURLU
 </keywords>
 </info>
 <reply>
@@ -29,7 +30,7 @@ http
 lib658
 </tool>
 <name>
-HTTP GET
+Pass URL to libcurl with CURLOPT_CURLU
  </name>
  <command>
 http://%HOSTIP:%HTTPPORT/658

tests/data/test659

@@ -0,0 +1,54 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP GET
+CURLOPT_CURLU
+proxy
+</keywords>
+</info>
+<reply>
+<data nocheck="yes">
+HTTP/1.1 200 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Last-Modified: Tue, 13 Jun 2000 12:10:00 GMT
+ETag: "21025-dc7-39462498"
+Accept-Ranges: bytes
+Content-Length: 6
+Connection: close
+Content-Type: text/html
+Funny-head: yesyes
+
+-foo-
+</data>
+</reply>
+<client>
+<server>
+http
+</server>
+<tool>
+lib659
+</tool>
+<name>
+CURLOPT_CURLU without the path set - over proxy
+ </name>
+ <command>
+http://%HOSTIP:%HTTPPORT
+</command>
+</client>
+
+<verify>
+<strip>
+^User-Agent:.*
+</strip>
+<protocol>
+GET http://www.example.com:80/ HTTP/1.1
+Host: www.example.com
+Accept: */*
+Proxy-Connection: Keep-Alive
+
+</protocol>
+</verify>
+
+</testcase>