BUG/MEDIUM: misplaced exit and wrong exit code

Commit cb11fd2 ("MEDIUM: mworker: wait mode on reload failure")
introduced a regression, when HAProxy is used in daemon mode, it exits 1
after forking its children.

HAProxy should exit(0), the exit(EXIT_FAILURE) was expected to be use
when the master fail in master-worker mode.

Thanks to Emmanuel Hocdet for reporting this bug. No backport needed.
diff --git a/src/haproxy.c b/src/haproxy.c
index 9cbb3d5..d64058d 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -2574,12 +2574,13 @@
 			if (global.mode & MODE_MWORKER) {
 				protocol_unbind_all();
 				mworker_wait();
+				/* should never get there */
+				exit(EXIT_FAILURE);
 			}
 #if defined(USE_OPENSSL) && !defined(OPENSSL_NO_DH)
 			ssl_free_dh();
 #endif
-			/* should never get there */
-			exit(EXIT_FAILURE);
+			exit(0); /* parent must leave */
 		}
 
 		/* child must never use the atexit function */