Fix #15113 FP nullPointer with pthread functions (cppcheck-opensource#8946)

Author: chrchr-github

cfg/posix.cfg

@@ -4638,7 +4638,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
       <not-null/>
     </arg>
     <arg nr="2" direction="in">
-      <not-null/>
+      <not-uninit/>
     </arg>
   </function>
   <function name="pthread_cond_destroy">
@@ -4658,7 +4658,6 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
       <not-uninit/>
     </arg>
     <arg nr="2">
-      <not-null/>
       <not-uninit/>
     </arg>
   </function>

test/cfg/posix.c

@@ -1524,9 +1524,11 @@ void pthread_cond_timedwait_test(pthread_cond_t *cond, pthread_mutex_t *mutex, c
 
 void pthread_cond_init_test(pthread_cond_t *cond, const pthread_condattr_t *attr)
 {
-    // cppcheck-suppress nullPointer
     (void)pthread_cond_init(cond, NULL);
     (void)pthread_cond_init(cond, attr);
+    const pthread_condattr_t *uattr;
+    // cppcheck-suppress uninitvar
+    (void)pthread_cond_init(cond, uattr);
 }
 
 void pthread_cond_destroy_test(const pthread_cond_t *cond)
@@ -1540,6 +1542,12 @@ void pthread_cleanup_push_test(void (*routine)(void *), void *arg)
     pthread_cleanup_pop(0);
 }
 
+void pthread_cleanup_push_test_NULL(void (*routine)(void *))
+{
+    pthread_cleanup_push(routine, NULL);
+    pthread_cleanup_pop(0);
+}
+
 void pthread_mutexattr_init_test(pthread_mutexattr_t *attr)
 {
     (void)pthread_mutexattr_init(attr);
@@ -1606,4 +1614,4 @@ void pthread_define_test()
     (void)rwlock;
     PTHREAD_SCOPE_PROCESS;
     PTHREAD_SCOPE_SYSTEM;
-}
+}