Add _FORTIFY_SOURCE to mdadm.O2 build.

When building mdadm.O2, set _FORTIFY_SOURCE to get more
warnings, and also build mdmon.O2 to find warnings in that
code too.
Then fix the warnings.

Suggested-by: Luca Berra <bluca@comedia.it>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 4 insertions, 1 deletions

diff --git a/mdmon.c b/mdmon.c
index 31d45fd5..8e62a68b 100644
--- a/mdmon.c
+++ b/mdmon.c
@@ -176,7 +176,10 @@ static void try_kill_monitor(pid_t pid, char *devname, int sock)
 	fl = fcntl(sock, F_GETFL, 0);
 	fl &= ~O_NONBLOCK;
 	fcntl(sock, F_SETFL, fl);
-	read(sock, buf, 100);
+	n = read(sock, buf, 100);
+	/* Ignore result, it is just the wait that
+	 * matters 
+	 */
 }
 
 void remove_pidfile(char *devname)