[glibc] rt: Initialize mq_send input on tst-mqueue{5,6}

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=cbf24edbb3123e3154ad2366912e0c1270ad3546

commit cbf24edbb3123e3154ad2366912e0c1270ad3546
Author: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
Date:   Wed Sep 21 10:51:06 2022 -0300

    rt: Initialize mq_send input on tst-mqueue{5,6}
    
    GCC with -Os warns that the mq_send input may be used uninitialized.
    Although for the tests the data content sent is not important, since
    both tests checks only if mq_notify was properly set, the warning is
    correct and data is indeed uninitialized.
    
    Checked on x86_64-linux-gnu and i686-linux-gnu.
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>
    Tested-by: Carlos O'Donell <carlos@redhat.com>

Diff:
---
 rt/tst-mqueue5.c | 2 +-
 rt/tst-mqueue6.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/rt/tst-mqueue5.c b/rt/tst-mqueue5.c
index 70d97a36c2..2b19b6a031 100644
--- a/rt/tst-mqueue5.c
+++ b/rt/tst-mqueue5.c
@@ -58,7 +58,7 @@ rtmin_handler (int sig, siginfo_t *info, void *ctx)
 static int
 (mqsend) (mqd_t q, int line)
 {
-  char c;
+  char c = 0;
   if (mq_send (q, &c, 1, 1) != 0)
     {
       printf ("mq_send on line %d failed with: %m\n", line);
diff --git a/rt/tst-mqueue6.c b/rt/tst-mqueue6.c
index bc875f101e..a22ac05aca 100644
--- a/rt/tst-mqueue6.c
+++ b/rt/tst-mqueue6.c
@@ -40,7 +40,7 @@
 static int
 (mqsend) (mqd_t q, int line)
 {
-  char c;
+  char c = 0;
   if (mq_send (q, &c, 1, 1) != 0)
     {
       printf ("mq_send on line %d failed with: %m\n", line);