Staging: gs_fpgaboot: Use octal permissions '0444'

Fixed following checkpatch warning
WARNING: Symbolic permissions 'S_IRUGO' are not preferred. Consider
using octal permissions '0444'.
Signed-off-by: Shyam Saini <mayhs11saini@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/gs_fpgaboot/gs_fpgaboot.c

@@ -38,7 +38,7 @@ static u8 bits_magic[] = {
 static struct platform_device	*firmware_pdev;
 
 static char	*file = "xlinx_fpga_firmware.bit";
-module_param(file, charp, S_IRUGO);
+module_param(file, charp, 0444);
 MODULE_PARM_DESC(file, "Xilinx FPGA firmware file.");
 
 static void read_bitstream(char *bitdata, char *buf, int *offset, int rdsize)