firmware: improve description of firmware_request_nowarn

The doubled 'however' is confusing. Simplify the comment a little and
reformat the paragraph.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Luis Chamberlain <mcgrof@kernel.org>
Link: https://lore.kernel.org/r/20200702221107.6562-1-wsa+renesas@sang-engineering.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/firmware_loader/main.c

@@ -838,12 +838,12 @@ EXPORT_SYMBOL(request_firmware);
  * @name: name of firmware file
  * @device: device for which firmware is being loaded
  *
- * This function is similar in behaviour to request_firmware(), except
- * it doesn't produce warning messages when the file is not found.
- * The sysfs fallback mechanism is enabled if direct filesystem lookup fails,
- * however, however failures to find the firmware file with it are still
- * suppressed. It is therefore up to the driver to check for the return value
- * of this call and to decide when to inform the users of errors.
+ * This function is similar in behaviour to request_firmware(), except it
+ * doesn't produce warning messages when the file is not found. The sysfs
+ * fallback mechanism is enabled if direct filesystem lookup fails. However,
+ * failures to find the firmware file with it are still suppressed. It is
+ * therefore up to the driver to check for the return value of this call and to
+ * decide when to inform the users of errors.
  **/
 int firmware_request_nowarn(const struct firmware **firmware, const char *name,
 			    struct device *device)