bhyve: change suspend exit code

Currently, after suspending, bhyve(8) exits with 0. This code is
also used to indicate that a VM was rebooted. To differentiate
reboot and suspend, use the next available exit code, 5, for suspend.

Approved by:		markj
Sponsored by:		The FreeBSD Foundation
MFC after:		2 weeks
Differential Revision:	https://reviews.freebsd.org/D54087

usr.sbin/bhyve/bhyve.8

@@ -25,7 +25,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd October 28, 2025
+.Dd December 4, 2025
 .Dt BHYVE 8
 .Os
 .Sh NAME
@@ -1158,6 +1158,8 @@ halted
 triple fault (amd64 only)
 .It 4
 exited due to an error
+.It 5
+suspended
 .El
 .Sh EXAMPLES
 If not using a boot ROM, the guest operating system must have been loaded with

usr.sbin/bhyve/snapshot.c

@@ -1308,7 +1308,7 @@ vm_checkpoint(struct vmctx *ctx, int fddir, const char *checkpoint_file,
 
 	if (stop_vm) {
 		vm_destroy(ctx);
-		exit(0);
+		exit(5);
 	}
 
 done: