fix firstlogin failed to create password on sid

packages/bsp/common/usr/lib/armbian/armbian-firstlogin

@@ -746,9 +746,17 @@ if [[ -f /root/.not_logged_in_yet && -n $(tty) ]]; then
 			fi
 		fi
 
-		# only allow one login. Once you enter root password, kill others.
-		loginfrom=$(who am i | awk '{print $2}')
-		who -la | grep root | grep -v "$loginfrom" | awk '{print $7}' | xargs --no-run-if-empty kill -9
+		# Get current session identifiers
+		current_tty=$(tty | sed 's:/dev/::')  # e.g., "tty1"
+		current_pid=$$
+
+		# Kill ONLY other active root SHELL sessions (not login processes)
+		ps -u root -o pid,tty,comm |
+		  awk -v me="$current_tty" -v mypid="$current_pid" '
+		    NR>1 && $2 != "?" && $2 != me && $1 != mypid && $3 ~ /sh$/ {
+		      print $1
+		    }' |
+		  xargs --no-run-if-empty kill -9
 
 		# enable motd
 		chmod +x /etc/update-motd.d/*