misc: alcor_pci: fix inverted branch condition

This patch fixes a trivial mistake that I made in the previous attempt
in fixing the null bridge issue. The branch condition is inverted and we
should call alcor_pci_find_cap_offset() only if bridge is not null.

Reported-by: Colin Ian King <[e-mail]>
Fixes: 3ce3e45cc333 ("misc: alcor_pci: fix null-ptr-deref when there is no PCI bridge")
Signed-off-by: Tong Zhang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/misc/cardreader/alcor_pci.c

···
 	 * priv->parent_pdev will be NULL. In this case we don't check its
 	 * capability and disable ASPM completely.
 	 */
-	if (!priv->parent_pdev)
+	if (priv->parent_pdev)
 		priv->parent_cap_off = alcor_pci_find_cap_offset(priv,
 							 priv->parent_pdev);