qemu-char: fix MISSING_COMMA

Signed-off-by: NGonglei <arei.gonglei@huawei.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

qemu-char.c

@@ -464,7 +464,7 @@ static const char * const mux_help[] = {
     "% h    print this help\n\r",
     "% x    exit emulator\n\r",
     "% s    save disk data back to file (if -snapshot)\n\r",
-    "% t    toggle console timestamps\n\r"
+    "% t    toggle console timestamps\n\r",
     "% b    send break (magic sysrq)\n\r",
     "% c    switch between console and monitor\n\r",
     "% %  sends %\n\r",