Some corrections of the previous commit

xorriso-dd-target/xorriso-dd-target.xdt

@@ -7,7 +7,7 @@
 
 # All names of variables and functions begin by "xdt_" in order to facilitate
 # the re-use of this code by inclusion or forking and expansion.
-# Before using most of the other functions it is necessary to run
+# Before using most of the functions it is necessary to run
 #   xdt_init ; xdt_reset_job 
 # The only function which may be run earlier is xdt_set_lang_c .
 # The function xtd_main gets run by the code at the end of this file
@@ -767,11 +767,10 @@ xdt_decide_writing()
           xdt_dummy=dummy
         else
           echo "WRITE RUN PREVENTED by user input '$xdt_dummy'." >&2
-          return 12  
+          return 17  
         fi
       fi
-      xdt_write_image "$xdt_image_file" $xdt_candidates
-      exit $?
+      xdt_write_image "$xdt_image_file" $xdt_candidates || return "$?"
     else
       xdt_candidates=$(echo $xdt_candidates)
       if test -n "$xdt_dummy_run"
@@ -815,32 +814,32 @@ xdt_decide_writing()
 xdt_main()
 {
   xdt_set_lang_c
-  xdt_init || exit "$?"
+  xdt_init || return "$?"
   
   xdt_reset_job
-  xdt_arg_interpreter "$@" || exit "$?"
+  xdt_arg_interpreter "$@" || return "$?"
   
   if test -n "$xdt_do_plug_test"
   then
-    xdt_plug_in_watcher || exit "$?"
+    xdt_plug_in_watcher || return "$?"
   fi
   
-  xdt_list_devices || exit "$?"
+  xdt_list_devices || return "$?"
 
   if test -z "$xdt_list_all" -a -n "$xdt_do_write"
   then
-    xdt_decide_writing || exit "$?"
+    xdt_decide_writing || return "$?"
   fi
   
   if test -n "$xdt_devs"
   then
-    exit $xdt_not_advised
+    return $xdt_not_advised
   fi
   return 0
 }
 
 if test -z "$no_xorriso_dd_target_run"
 then
-  xdt_main "$@"
+  xdt_main "$@" || exit "$?"
 fi