hwmon: Fix PCI device reference leak in quirk

Thankfully this only affects systems with one specific south bridge
and is most probably harmless unless the hwmon module is heavily
cycled.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/hwmon.c

@@ -84,10 +84,9 @@ static void __init hwmon_pci_quirks(void)
 
 	/* Open access to 0x295-0x296 on MSI MS-7031 */
 	sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
-	if (sb &&
-	    (sb->subsystem_vendor == 0x1462 &&	/* MSI */
-	     sb->subsystem_device == 0x0031)) {	/* MS-7031 */
-
+	if (sb) {
+		if (sb->subsystem_vendor == 0x1462 &&	/* MSI */
+		    sb->subsystem_device == 0x0031) {	/* MS-7031 */
 			pci_read_config_byte(sb, 0x48, &enable);
 			pci_read_config_word(sb, 0x64, &base);
 
@@ -95,8 +94,11 @@ static void __init hwmon_pci_quirks(void)
 				dev_info(&sb->dev,
 					 "Opening wide generic port at 0x295\n");
 				pci_write_config_word(sb, 0x64, 0x295);
-			pci_write_config_byte(sb, 0x48, enable | BIT(2));
+				pci_write_config_byte(sb, 0x48,
+						      enable | BIT(2));
+			}
 		}
+		pci_dev_put(sb);
 	}
 #endif
 }