fix usb cmd transaction timeout

ChangeLog

@@ -1,3 +1,6 @@
+2013-12-23 Rolf Bensch <rolf at bensch hyphen online dot de>
+	* backend/pixma_common.c: fix usb cmd transaction timeout
+
 2013-12-23 Stéphane Voltz <stef.dev@free.fr>
 	* backend/genesys_devices.c backend/genesys.c backend/genesys_low.h
 	backend/genesys_gl841.[ch]: color calibration improvement for LiDE80,

backend/pixma_common.c

@@ -655,7 +655,10 @@ pixma_cmd_transaction (pixma_t * s, const void *cmd, unsigned cmdlen,
     {
       error = pixma_read (s->io, data, expected_len);
       if (error == PIXMA_ETIMEDOUT)
+      {
         PDBG (pixma_dbg (2, "No response yet. Timed out in %d sec.\n", tmo));
+        pixma_sleep (1000000);          /* 1s timeout */
+      }
     }
   while (error == PIXMA_ETIMEDOUT && --tmo != 0);
   if (error < 0)