trivial: Fix misspelling of firmware

Fix misspelling of firmware.

Signed-off-by: Nick Andrew <nick@nick-andrew.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 6d61200..dab33a2 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -550,7 +550,7 @@
  * @dev: PCI device to handle.
  * @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
  *
- * Transition a device to a new power state, using the platform formware and/or
+ * Transition a device to a new power state, using the platform firmware and/or
  * the device's PCI PM registers.
  *
  * RETURN VALUE: