tool_operate: more transfer cleanup after parallel transfer fail

In some circumstances when doing parallel transfers, the
single_transfer_cleanup() would not be called and then 'inglob' could
leak.

Test 496 verifies

Reported-by: Trail of Bits
Closes #9749

tests/data/Makefile.inc

@@ -73,7 +73,7 @@ test430 test431 test432 test433 test434 test435 test436 \
 \
 test440 test441 test442 test443 test444 \
 \
-test490 test491 test492 test493 test494 test495 \
+test490 test491 test492 test493 test494 test495 test496 \
 \
 test500 test501 test502 test503 test504 test505 test506 test507 test508 \
 test509 test510 test511 test512 test513 test514 test515 test516 test517 \

tests/data/test496

@@ -0,0 +1,36 @@
+<testcase>
+<info>
+<keywords>
+curl tool
+cmdline
+parallel
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+none
+</server>
+<name>
+parallel upload missing file
+</name>
+ <command>
+0 -Z -Tz
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<errorcode>
+26
+</errorcode>
+</verify>
+</testcase>