Fix vulkan compile

src/gpu/vk/GrVkMemory.cpp

 /*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #include "GrVkMemory.h"
 
 #include "GrVkGpu.h"
@@ skipping 302 matching lines @@
                 Block* block = iter.get();
                 if (largestSize < block->fSize) {
                     largestSize = block->fSize;
                 }
                 iter.next();
             }
             SkASSERT(largestSize == fLargestBlockSize);
 #endif
         }
         fFreeSize -= alignedSize;
-        SkASSERT(allocSize > 0);
+        SkASSERT(*allocSize > 0);
 
         return true;
     }
 
     SkDebugf("Can't allocate %d bytes, %d bytes available, largest free block %d\n", alignedSize, fFreeSize, fLargestBlockSize);
 
     return false;
 }
 
 void GrVkFreeListAlloc::free(VkDeviceSize allocOffset, VkDeviceSize allocSize) {
@@ skipping 214 matching lines @@
             fSubHeaps[i]->free(alloc);
             fUsedSize -= alloc.fSize;
             return true;
         }
     }
 
     return false;
 }