tests: net: buf: Fix invalid check in test

This fixes using invalid byte array for verification of 64 bit
value.

Signed-off-by: Mariusz Skamra <[email protected]>

Author: MariuszSkamra

tests/net/buf/src/main.c

@@ -573,7 +573,7 @@ ZTEST(net_buf_tests, test_net_buf_byte_order)
 	zassert_mem_equal(le64, net_buf_pull_mem(buf, sizeof(le64)),
 			  sizeof(le64), "Invalid 64 bits byte order");
 	zassert_mem_equal(be64, net_buf_pull_mem(buf, sizeof(be64)),
-			  sizeof(be48), "Invalid 64 bits byte order");
+			  sizeof(be64), "Invalid 64 bits byte order");
 
 	/* push/remove byte order */
 	net_buf_reset(buf);