-J -O: use -O name if no Content-Disposition header comes!

A regression between 7.22.0 and 7.23.0 -- downloading a file with the
flags -O and -J results in the content being written to stdout if and
only if there was no Content-Disposition header in the http response. If
there is a C-D header with a filename attribute, the output is correctly
written.

Reported by: Dave Reisner
Bug: http://curl.haxx.se/mail/archive-2011-11/0030.html

tests/data/Makefile.am

@@ -77,7 +77,7 @@ test1110 test1111 test1112 test1113 test1114 test1115 test1116 test1117	\
 test1118 test1119 test1120 test1121 test1122 test1123 test1124 test1125	\
 test1126 test1127 test1128 test1129 test1130 test1131 \
 test1200 test1201 test1202 test1203 test1204 test1205 test1206 test1207 \
-test1208 test1209 \
+test1208 test1209 test1210 \
 test1300 test1301 test1302 test1303 test1304 test1305	\
 test1306 test1307 test1308 test1309 test1310 test1311 test1312 test1313 \
 test1314 \

tests/data/test1210

@@ -0,0 +1,63 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP GET
+-J
+</keywords>
+</info>
+
+#
+<reply>
+<data nocheck="yes">
+HTTP/1.1 200 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 6
+Connection: close
+Content-Type: text/html
+
+12345
+</data>
+</reply>
+
+#
+# Client-side
+<client>
+# this relies on the debug feature to allow us to set directory to store the
+# -O output in, using the CURL_TESTDIR variable
+<features>
+debug
+</features>
+<server>
+http
+</server>
+<name>
+HTTP GET with -J without Content-Disposition
+</name>
+<setenv>
+CURL_TESTDIR=%PWD/log
+</setenv>
+<command option="no-output,no-include">
+http://%HOSTIP:%HTTPPORT/1210 -J -O
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent:.*
+</strip>
+<protocol>
+GET /1210 HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+Accept: */*
+
+</protocol>
+<file name="log/1210">
+12345
+</file>
+
+</verify>
+</testcase>