staging: rts_pstor: Fix a miswriting

cppcheck reported: [staging/rts_pstor/sd.c:3730] -> [staging/rts_pstor/sd.c:3726]: (style) Found duplicate if expressions.
It's a miswriting, and the second if expression should be "(rsp_type == SD_RSP_TYPE_R0)"

Signed-off-by: wwang <wei_wang@realsil.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>