Address MSVC type errors

Author: mkitti

numcodecs/zstd.pyx

@@ -175,6 +175,7 @@ def decompress(source, dest=None):
         char* dest_ptr
         size_t source_size, dest_size, decompressed_size
         size_t nbytes, cbytes, blocksize
+        size_t dest_nbytes
 
     # obtain source memoryview
     source_mv = ensure_continguous_memoryview(source)
@@ -231,7 +232,7 @@ def decompress(source, dest=None):
     return dest
 
 
-cdef findTotalContentSize(const void* source_ptr, size_t source_size):
+cdef findTotalContentSize(const char* source_ptr, size_t source_size):
     cdef:
         unsigned long long frame_content_size = 0
         unsigned long long total_content_size = 0