qtest/ahci: Fix a bit mask expression

A thinko that clang 3.5.0 caught.
Thankfully does not introduce any new failures.
Signed-off-by: NJohn Snow <jsnow@redhat.com>
Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

tests/ahci-test.c

@@ -583,7 +583,7 @@ static void ahci_test_port_spec(AHCIQState *ahci, uint8_t port)
         ASSERT_BIT_CLEAR(reg, AHCI_PX_CMD_MPSP);
     }
     /* If, via CPD or MPSP we detect a drive, HPCP must be on. */
-    if (BITANY(reg, AHCI_PX_CMD_CPD || AHCI_PX_CMD_MPSP)) {
+    if (BITANY(reg, AHCI_PX_CMD_CPD | AHCI_PX_CMD_MPSP)) {
         ASSERT_BIT_SET(reg, AHCI_PX_CMD_HPCP);
     }
     /* HPCP and ESP cannot both be active. */