staging: CSR: fix function declaration warnings

Sparse is warning about non-ANSI function declaration.
Add void to the parameterless function.

drivers/staging/csr/csr_wifi_hip_chiphelper.c:633:31: warning:
	non-ANSI function declaration of function 'ChipHelper_Null'

I also fixed this checkpatch error:
ERROR: "foo* bar" should be "foo *bar"
Signed-off-by: NEmil Goode <emilgoode@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/csr/csr_wifi_hip_chiphelper.c

@@ -630,7 +630,7 @@ ChipDescript* ChipHelper_GetVersionUniFi(CsrUint16 ver)
 }
 
 
-ChipDescript* ChipHelper_Null()
+ChipDescript *ChipHelper_Null(void)
 {
     return &chip_device_desc_null;
 }