staging: net: wimax: i2400m: fw: Fix incorrectly spelt function parameter in document...

staging: net: wimax: i2400m: fw: Fix incorrectly spelt function parameter in documentation

Fixes the following W=1 kernel build warning(s):

 drivers/net/wimax/i2400m/fw.c:647: warning: Function parameter or member '__chunk_len' not described in 'i2400m_download_chunk'
 drivers/net/wimax/i2400m/fw.c:647: warning: Excess function parameter 'chunk_len' description in 'i2400m_download_chunk'

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
Cc: linux-wimax@intel.com
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Yanir Lubetkin <yanirx.lubetkin@intel.com>
Cc: netdev@vger.kernel.org
Cc: devel@driverdev.osuosl.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20201112131959.2213841-7-lee.jones@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>