make tensor_accessor compatible with mac os builds

Differential Revision: D66596477

Pull Request resolved: #7159

Author: itisgrisha

extension/tensor/tensor_accessor.h

@@ -178,16 +178,16 @@ executorch::runtime::Result<TensorAccessor<T, N>> make_tensor_accessor(
 
   if (N != tensor.dim()) {
     ET_LOG(
-        Error, "Expecting %zd dimensions but tensor has %zd.", N, tensor.dim());
+        Error, "Expecting %zd dimensions but tensor has %zd.", static_cast<ssize_t>(N), static_cast<ssize_t>(tensor.dim()));
     return executorch::runtime::Error::InvalidArgument;
   }
 
   if (sizeof(T) != tensor.element_size()) {
     ET_LOG(
         Error,
         "Size of data type template argument (%zd) not equal to tensor element size (%zd)",
-        sizeof(T),
-        tensor.element_size());
+        static_cast<ssize_t>(sizeof(T)),
+        static_cast<ssize_t>(tensor.element_size()));
     return executorch::runtime::Error::InvalidArgument;
   }