shellcheck: Fix SC2124

  SC2124 (warning): Assigning an array to a string! Assign as array, or
  use * instead of @ to concatenate.

Shouldn't be a bug since bash concatenates with space and eval is
used on the result.

Reviewed-by: Andrew Jones <andrew.jones@linux.dev>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Andrew Jones <andrew.jones@linux.dev>
diff --git a/scripts/arch-run.bash b/scripts/arch-run.bash
index 45ec8f5..95b6fa6 100644
--- a/scripts/arch-run.bash
+++ b/scripts/arch-run.bash
@@ -150,7 +150,7 @@
 		return 77
 	fi
 
-	migcmdline=$@
+	migcmdline=("$@")
 
 	trap 'trap - TERM ; kill 0 ; exit 2' INT TERM
 	trap 'rm -f ${src_out} ${dst_out} ${src_outfifo} ${dst_outfifo} ${dst_incoming} ${src_qmp} ${dst_qmp} ${src_infifo} ${dst_infifo}' RETURN EXIT
@@ -179,7 +179,7 @@
 	exec {src_infifo_fd}<>${src_infifo}
 	exec {dst_infifo_fd}<>${dst_infifo}
 
-	eval "$migcmdline" \
+	eval "${migcmdline[@]}" \
 		-chardev socket,id=mon,path=${src_qmp},server=on,wait=off \
 		-mon chardev=mon,mode=control \
 		< ${src_infifo} > ${src_outfifo} &
@@ -219,7 +219,7 @@
 
 do_migration ()
 {
-	eval "$migcmdline" \
+	eval "${migcmdline[@]}" \
 		-chardev socket,id=mon,path=${dst_qmp},server=on,wait=off \
 		-mon chardev=mon,mode=control -incoming unix:${dst_incoming} \
 		< ${dst_infifo} > ${dst_outfifo} &