Make sure net backend release all memory when finished.

backend/net.c

@@ -413,8 +413,11 @@ sane_exit (void)
 	  sanei_w_call (&dev->wire, SANE_NET_EXIT,
 			(WireCodecFunc) sanei_w_void, 0,
 			(WireCodecFunc) sanei_w_void, 0);
+          sanei_w_exit(&dev->wire);
 	  close (dev->ctl);
 	}
+      if (dev->name)
+        free(dev->name);
       free (dev);
     }
 }

include/sane/sanei_wire.h

@@ -70,6 +70,7 @@ typedef struct Wire
 Wire;
 
 extern void sanei_w_init (Wire *w, void (*codec_init)(Wire *));
+extern void sanei_w_exit (Wire *w);
 extern void sanei_w_space (Wire *w, size_t howmuch);
 extern void sanei_w_void (Wire *w);
 extern void sanei_w_byte (Wire *w, SANE_Byte *v);

sanei/sanei_wire.c

@@ -446,3 +446,12 @@ sanei_w_init (Wire *w, void (*codec_init_func)(Wire *))
   if (codec_init_func != 0)
     (*codec_init_func) (w);
 }
+
+void
+sanei_w_exit (Wire *w)
+{
+  if (w->buffer.start)
+    free(w->buffer.start);
+  w->buffer.start = 0;
+  w->buffer.size = 0;
+}