cleaning some temporary files in gameshell

I'm not sure why, but even after this commit, while running in debug
mode, some temporary environment files (the "env_before" and "env_after"
files) still do not get deleted.

lib/bin_test.sh

@@ -6,11 +6,13 @@ test_mktemp() (
   if ! tmp=$(mktemp 2>/dev/null)
   then
     echo "Error: command 'mktemp' not working." >&2
+    rm -f "$tmp"
     return 1
   fi
   if [ -z "$tmp" ]
   then
     echo "Error: command 'mktemp' returned the empty string." >&2
+    rm -f "$tmp"
     return 1
   fi
   rm -f "$tmp"

lib/gsh.sh

@@ -261,12 +261,14 @@ __gsh_start() {
       then
         echo "$(gettext "Error: no mission was found!
 Aborting.")" >&2
+        rm -f "$env_before" "$env_after"
         exit 1
       fi
       color_echo yellow "$(eval_gettext "Error: mission \$MISSION_NB is cancelled because some dependencies are not met.")" >&2
       GSH_CANCELLED=$GSH_CANCELLED:$MISSION_NB
       __log_action "$MISSION_NB" "CANCEL_DEP_PB"
       __gsh_start "$((MISSION_NB + 1))"
+      rm -f "$env_before" "$env_after"
       return
     fi
     unset GSH_CANCELLED
@@ -281,10 +283,10 @@ Aborting.")" >&2
 Run the command
     \$ gsh reset
 to make sure the mission is initialized properly.")" >&2
-        rm -f "$env_before" "$env_after"
       fi
     fi
   fi
+  rm -f "$env_before" "$env_after"
 
   __log_action "$MISSION_NB" "START"
 

lib/gshrc

@@ -28,7 +28,7 @@ if [ -s "$tempfile" ]
 then
   export PAGER=more
 fi
-rm -f "$mktemp"
+rm -f "$tempfile"
 
 # try to prevent using sudo and similar
 su() {