psx: update vendored sources

Retrieved from upstream at
https://git.kernel.org/pub/scm/libs/libcap/libcap.git ref
e79c7f06e1713eaae11119de4d8abfb4c77c6428.

`libpsx` is written by Andrew G. Morgan <morgan@kernel.org>. See
`cbits/psx/License`.

See: https://git.kernel.org/pub/scm/libs/libcap/libcap.git/tree/psx?id=e79c7f06e1713eaae11119de4d8abfb4c77c6428

psx/CHANGELOG.md

@@ -1,5 +1,9 @@
 # Revision history for psx
 
+## 0.1.2.0 -- YYYY-mm-dd
+
+* Update vendored sources.
+
 ## 0.1.1.1 -- 2023-02-28
 
 * Remove `-Wl,-undefined,__wrap_sigfillset` from link options.

psx/cbits/psx/License

@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-only */
+
 Unless otherwise *explicitly* stated, the following text describes the
 licensed conditions under which the contents of this libcap/psx release
 may be used and distributed.

psx/cbits/psx/psx.c

@@ -516,7 +516,7 @@ int __wrap_pthread_create(pthread_t *thread, const pthread_attr_t *attr,
     pthread_sigmask(SIG_BLOCK, &sigbit, NULL);
 
     int ret = __real_pthread_create(thread, attr, _psx_start_fn, starter);
-    if (ret == -1) {
+    if (ret > 0) {
 	psx_new_state(_PSX_CREATE, _PSX_IDLE);
 	memset(starter, 0, sizeof(*starter));
 	free(starter);