arm/nseries: Fix warnings from Sparse

Sparse report:

arm/nseries.c:1406:5: warning: returning void-valued expression
arm/nseries.c:1411:5: warning: returning void-valued expression

Cc: Andrzej Zaborowski <balrogg@gmail.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

hw/arm/nseries.c

diff --git a/hw/arm/nseries.c b/hw/arm/nseries.c
index 4d7be5e..2a5406d 100644
--- a/hw/arm/nseries.c
+++ b/hw/arm/nseries.c
@@ -1403,12 +1403,12 @@
 
 static void n800_init(MachineState *machine)
 {
-    return n8x0_init(machine, &n800_binfo, 800);
+    n8x0_init(machine, &n800_binfo, 800);
 }
 
 static void n810_init(MachineState *machine)
 {
-    return n8x0_init(machine, &n810_binfo, 810);
+    n8x0_init(machine, &n810_binfo, 810);
 }
 
 static QEMUMachine n800_machine = {