fix wakeup()

SPIFlash.cpp

@@ -179,7 +179,7 @@ void SPIFlash::command(uint8_t cmd, boolean isWrite){
   //  that is because some chips can take several seconds to carry out a chip erase or other similar multi block or entire-chip operations
   //  a recommended alternative to such situations where chip can be or not be present is to add a 10k or similar weak pulldown on the
   //  open drain MISO input which can read noise/static and hence return a non 0 status byte, causing the while() to hang when a flash chip is not present
-  while(busy());
+  if (cmd != SPIFLASH_WAKE) while(busy());
   select();
   SPI.transfer(cmd);
 }