fix zdb -R for raw flag

Write was returing wrong size due to some non printable characters
in buffer So, I replaced Write with putchar.

ZFSin/zfs/cmd/zdb/zdb.c

@@ -5059,9 +5059,11 @@ zdb_dump_gbh(void *buf, int flags)
 static void
 zdb_dump_block_raw(void *buf, uint64_t size, int flags)
 {
+	unsigned char* str = buf;
 	if (flags & ZDB_FLAG_BSWAP)
 		byteswap_uint64_array(buf, size);
-	VERIFY(write(_fileno(stdout), buf, size) == size);
+	for (int i = 0; i < size; i++)
+		(void)putchar(str[i]);
 }
 
 static void