numa: Add missing \n to error message

If memory allocation fails when using -mem-path, QEMU is supposed to print
out a message to indicate that fallback to anonymous RAM is deprecated. This
is done with error_printf() which does output buffering. As a consequence,
the message is only printed at the next flush, eg. when quiting QEMU, and
it also lacks a trailing newline:

qemu-system-ppc64: unable to map backing store for guest RAM: Cannot allocate memory
qemu-system-ppc64: warning: falling back to regular RAM allocation
QEMU 4.1.50 monitor - type 'help' for more information
(qemu) q
This is deprecated. Make sure that -mem-path  specified path has sufficient resources to allocate -m specified RAM amountgreg@boss02:~/Work/qemu/qemu-spapr$

Add the missing \n to fix both issues.

Fixes: cb79224 "deprecate -mem-path fallback to anonymous RAM"
Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <157304440026.351774.14607704217028190097.stgit@bahia.lan>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

hw/core/numa.c

@@ -503,7 +503,7 @@ static void allocate_system_memory_nonnuma(MemoryRegion *mr, Object *owner,
             warn_report("falling back to regular RAM allocation");
             error_printf("This is deprecated. Make sure that -mem-path "
                          " specified path has sufficient resources to allocate"
-                         " -m specified RAM amount");
+                         " -m specified RAM amount\n");
             /* Legacy behavior: if allocation failed, fall back to
              * regular RAM allocation.
              */