A bunch of tiny fixes

run

@@ -8,7 +8,6 @@ cpus=1
 debug_vm=''
 kgdb=false
 kvm=false
-nographic=false
 # norandmaps: Don't use address space randomization. Equivalent to echo 0 > /proc/sys/kernel/randomize_va_space.
 # printk.time=y: log in format: "[time ] msg" for all printk messages.
 # nokaslr: https://unix.stackexchange.com/questions/397939/turning-off-kaslr-to-debug-linux-kernel-using-qemu-and-gdb
@@ -59,7 +58,6 @@ while getopts a:c:Dde:G:giKknt:x OPT; do
     n)
       extra_append="$extra_append console=ttyS0"
       extra_flags_qemu="$extra_flags -nographic"
-      nographic=true
       ;;
   esac
 done
@@ -115,7 +113,7 @@ else
   extra_flags="${extra_flags_qemu} ${extra_flags}"
   images_dir="${out_dir}/images"
   qemu_common="\
-'${debug_vm}' \
+${debug_vm} \
 '${out_dir}/host/usr/bin/qemu-system-${arch}' \
 -m 128M \
 -monitor telnet::45454,server,nowait \