net: nfs: Correct the reply data buffer size

The type of the buffer is uint32_t, but the parameter used to size it
is referring to bytes. Divide by the size of the array elements.

Strictly speaking, this shouldn't be needed at all... It could just be 1
just like the request.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>

net/nfs.h

@@ -76,7 +76,7 @@ struct rpc_t {
 			uint32_t verifier;
 			uint32_t v2;
 			uint32_t astatus;
-			uint32_t data[NFS_READ_SIZE];
+			uint32_t data[NFS_READ_SIZE / sizeof(uint32_t)];
 		} reply;
 	} u;
 };