pci: Correct a few comments and nits

Two comments are missing a parameter and there is an extra blank line. Also
two of the region access macros are misnamed. Correct these problems.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

drivers/pci/pci-uclass.c

@@ -289,7 +289,6 @@ int dm_pci_write_config(struct udevice *dev, int offset, unsigned long value,
 				    size);
 }
 
-
 int pci_write_config32(pci_dev_t bdf, int offset, u32 value)
 {
 	return pci_write_config(bdf, offset, value, PCI_SIZE_32);

include/pci.h

@@ -1007,6 +1007,7 @@ int dm_pci_hose_probe_bus(struct udevice *bus);
  *
  * @bus:	Bus to read from
  * @bdf:	PCI device address: bus, device and function -see PCI_BDF()
+ * @offset:	Register offset to read
  * @valuep:	Place to put the returned value
  * @size:	Access size
  * @return 0 if OK, -ve on error
@@ -1019,6 +1020,7 @@ int pci_bus_read_config(struct udevice *bus, pci_dev_t bdf, int offset,
  *
  * @bus:	Bus to write from
  * @bdf:	PCI device address: bus, device and function -see PCI_BDF()
+ * @offset:	Register offset to write
  * @value:	Value to write
  * @size:	Access size
  * @return 0 if OK, -ve on error
@@ -1260,9 +1262,9 @@ void *dm_pci_map_bar(struct udevice *dev, int bar, int flags);
 #define dm_pci_mem_to_virt(dev, addr, len, map_flags) \
 	dm_pci_bus_to_virt((dev), (addr), PCI_REGION_MEM, (len), (map_flags))
 #define dm_pci_virt_to_io(dev, addr) \
-	dm_dm_pci_virt_to_bus((dev), (addr), PCI_REGION_IO)
+	dm_pci_virt_to_bus((dev), (addr), PCI_REGION_IO)
 #define dm_pci_io_to_virt(dev, addr, len, map_flags) \
-	dm_dm_pci_bus_to_virt((dev), (addr), PCI_REGION_IO, (len), (map_flags))
+	dm_pci_bus_to_virt((dev), (addr), PCI_REGION_IO, (len), (map_flags))
 
 /**
  * dm_pci_find_device() - find a device by vendor/device ID