Fix typo

Change-Id: I571e84cab9258dfd5e94b70865505f452ed89016

Author: vsytch

device/pal/paldevice.hpp

@@ -259,7 +259,7 @@ class Device : public NullDevice {
     Resource::MemoryType type_;       //!< The buffer's type
     size_t bufSize_;                  //!< Staged buffer size
     std::list<Memory*> freeBuffers_;  //!< The list of free buffers
-    std:atomic<uint> acquiredCnt_;   //!< The total number of acquired buffers
+    std::atomic<uint> acquiredCnt_;   //!< The total number of acquired buffers
     amd::Monitor lock_;               //!< Stgaed buffer acquire/release lock
     const Device& gpuDevice_;         //!< GPU device object
   };