tests: fix typo in char unit test comment

Signed-off-by: xieyi <xieyi@kylinos.cn>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

tests/unit/test-char.c

@@ -710,7 +710,7 @@ static void char_hub_test(void)
         /*
          * Now we are good to go, first repeat "lost" sequence, which
          * was already consumed and drained by the ring buffers, but
-         * pipe have not recieved that yet.
+         * the pipe has not received it yet.
          */
         ret = qemu_chr_fe_write(&chr_fe, (void *)"thisisit", 8);
         g_assert_cmpint(ret, ==, 8);