testsuite, threads: add missing return statements

Add missing return statements in

  * gdb.threads/process-exit-status-is-leader-exit-status.c
  * gdb.threads/next-fork-exec-other-thread.c

to fix 'no return statement' compiler warnings, e.g.:

  process-exit-status-is-leader-exit-status.c: In function ‘start’:
  process-exit-status-is-leader-exit-status.c:46:1: warning: no return
    statement in function returning non-void [-Wreturn-type]
     46 | }
        | ^

Approved-By: Simon Marchi <simon.marchi@efficios.com>

2 files changed, 5 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.threads/next-fork-exec-other-thread.c b/gdb/testsuite/gdb.threads/next-fork-exec-other-thread.c
index 0645b55..7694a89 100644
--- a/gdb/testsuite/gdb.threads/next-fork-exec-other-thread.c
+++ b/gdb/testsuite/gdb.threads/next-fork-exec-other-thread.c
@@ -50,6 +50,8 @@ worker_a (void *pArg)
       waitpid (pid, NULL, 0);
       usleep (5);
     }
+
+  return NULL;
 }
 
 static void*
@@ -61,6 +63,8 @@ worker_b (void *pArg)
       usleep (5);  /* break here */
       usleep (5);  /* other line */
     }
+
+  return NULL;
 }
 
 int
diff --git a/gdb/testsuite/gdb.threads/process-exit-status-is-leader-exit-status.c b/gdb/testsuite/gdb.threads/process-exit-status-is-leader-exit-status.c
index 3fed562..bd998f9 100644
--- a/gdb/testsuite/gdb.threads/process-exit-status-is-leader-exit-status.c
+++ b/gdb/testsuite/gdb.threads/process-exit-status-is-leader-exit-status.c
@@ -43,6 +43,7 @@ start (void *arg)
   int thread_return_value = *(int *) arg;
 
   do_exit (thread_return_value);
+  return NULL;
 }
 
 int