Correct double-free on exit when using --watchfd - issue #96.

docs/ACKNOWLEDGEMENTS.md

@@ -94,6 +94,7 @@ is acknowledged and greatly appreciated:
  * [xmort](https://codeberg.org/xmort) - added "`--output`" option ([#90](https://codeberg.org/a-j-wood/pv/pulls/90))
  * [bogiord](https://codeberg.org/bogiord) - reported the loss of output block device size detection in 1.8.10, and suggested the fix ([#91](https://codeberg.org/a-j-wood/pv/issues/91))
  * [eborisch](https://codeberg.org/eborisch) - provided fix for misbehaviour when used with "`zfs send`" due to treating zero sized writes (generally due to timer interruption) as end of file ([#92](https://codeberg.org/a-j-wood/pv/pulls/92), [#93](https://codeberg.org/a-j-wood/pv/pulls/93))
- * [alexanderperlis](https://codeberg.org/alexanderperlis) - provided initial support for block devices with "`--size @FILE`"  ([#94](https://codeberg.org/a-j-wood/pv/pulls/94))
+ * [alexanderperlis](https://codeberg.org/alexanderperlis) - provided initial support for block devices with "`--size @FILE`" ([#94](https://codeberg.org/a-j-wood/pv/pulls/94))
+ * [jettero](https://codeberg.org/jettero) - reported double-free coredump when using "`--watchfd`" after 1.8.10 ([#96](https://codeberg.org/a-j-wood/pv/issues/96))
 
 ---

docs/NEWS.md

@@ -1,3 +1,7 @@
+### UNRELEASED
+
+ * fix: correct double-free on exit when using "`--watchfd`" ([#96](https://codeberg.org/a-j-wood/pv/issues/96)) reported by [jettero](https://codeberg.org/jettero)
+
 ### 1.8.13 - 18 August 2024
 
  * feature: when using "`--size @FILE`", _FILE_ can be a block device, and its size will be used (pull request [#94](https://codeberg.org/a-j-wood/pv/pulls/94)) supplied by [alexanderperlis](https://codeberg.org/alexanderperlis)

src/pv/watchpid.c

@@ -478,6 +478,7 @@ int pv_watchpid_scanfds(pvstate_t state,
 		/*@-mustfreeonly@ *//* splint - this is not a leak, this is a new entry. */
 		info_array[use_idx].state->control.name = NULL;
 		info_array[use_idx].state->control.format_string = NULL;
+		info_array[use_idx].state->control.output_name = NULL;
 		/*@+mustfreeonly@ */
 		info_array[use_idx].state->control.default_format[0] = '\0';
 		use_format_string =