PCI: Remove unused assignments

Remove variables and assignments that are never used.

Found by Krzysztof using cppcheck, e.g.,

$ cppcheck --enable=all --force
uselessAssignmentPtrArg drivers/pci/proc.c:102 Assignment of function parameter has no effect outside the function. Did you forget dereferencing it?
unreadVariable drivers/pci/setup-bus.c:1528 Variable 'old_flags' is assigned a value that is never used.

Reported-by: Krzysztof Wilczyński <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bjorn Helgaas <[e-mail]>

drivers/pci/pci-sysfs.c

···
 		u8 val;
 		pci_user_read_config_byte(dev, off, &val);
 		data[off - init_off] = val;
-		off++;
-		--size;
 	}
 
 	pci_config_pm_runtime_put(dev);
···
 		size -= 2;
 	}
 
-	if (size) {
+	if (size)
 		pci_user_write_config_byte(dev, off, data[off - init_off]);
-		off++;
-		--size;
-	}
 
 	pci_config_pm_runtime_put(dev);
 

drivers/pci/proc.c

···
 		unsigned char val;
 		pci_user_read_config_byte(dev, pos, &val);
 		__put_user(val, buf);
-		buf++;
 		pos++;
-		cnt--;
 	}
 
 	pci_config_pm_runtime_put(dev);
···
 		unsigned char val;
 		__get_user(val, buf);
 		pci_user_write_config_byte(dev, pos, val);
-		buf++;
 		pos++;
-		cnt--;
 	}
 
 	pci_config_pm_runtime_put(dev);

drivers/pci/setup-bus.c

···
 {
 	struct pci_dev *dev = bus->self;
 	struct resource *r;
-	unsigned int old_flags = 0;
+	unsigned int old_flags;
 	struct resource *b_res;
 	int idx = 1;