staging: rtl8723bs: os_dep: Remove Unneeded variable ret

fix below issue reported by coccicheck

drivers/staging/rtl8723bs/os_dep/ioctl_linux.c:2685:5-8: Unneeded
variable: "ret". Return "0" on line 3266

Signed-off-by: Hariprasad Kelam <hariprasad.kelam@gmail.com>

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Changes in v2:
  - make subject line more clean

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>