staging/csr: coding style fixes at sdio_linux_remove_irq and at install_irq

the following coding style problems were fixed:

1. move function return type from top to the starting of the function
2. remove all the spaces at the start of a line and used tabs

Signed-off-by: Devendra Naga <develkernel412222@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>