Make stumpish work on OpenBSD again

This fixes regression which was introduced by
stumpwm#296

util/stumpish/stumpish

@@ -51,12 +51,25 @@ stumpwm_pid ()
           echo "a bug in stumpish, please report it." 1>&2
           echo 1>&2
           exit 1
-      elif [ "$(cat /proc/${pid}/comm)" = "stumpwm" ]
+      elif [ -e "/proc/${pid}/comm" -a "$(cat /proc/${pid}/comm 2>/dev/null)" = "stumpwm" ]
       then
           STUMPWM_PID=$pid
           break
-      else
+      elif [ -n "$(which pgrep 2>/dev/null)" ]
+      then
+          pid=$(pgrep stumpwm)
+          if [ -n $pid ]
+          then
+              STUMPWM_PID=$pid
+              break
+          else
+              pid=1
+          fi
+      elif [ -e /proc/$pid/stat ]
+      then
           pid=$(cut -f 4 -d " " < /proc/$pid/stat)
+      else
+          pid=1
       fi
     done
 }