Documentation/driver-api: firmware/request_firmware: drop doubled word

Drop the doubled word "call".

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Acked-by: Luis Chamberlain <mcgrof@kernel.org>
Link: https://lore.kernel.org/r/20200704034502.17199-6-rdunlap@infradead.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/driver-api/firmware/request_firmware.rst

@@ -76,5 +76,5 @@ firmware. For example if you used request_firmware() and it returns,
 the driver has the firmware image accessible in fw_entry->{data,size}.
 If something went wrong request_firmware() returns non-zero and fw_entry
 is set to NULL. Once your driver is done with processing the firmware it
-can call call release_firmware(fw_entry) to release the firmware image
+can call release_firmware(fw_entry) to release the firmware image
 and any related resource.