staging: rtl8723bs: hal: rtl8723b_cmd: fix comparison to true is error prone

this patch fixes below issues reported by checkpatch

CHECK: Using comparison to true is error prone
CHECK: Using comparison to false is error prone

Signed-off-by: Hariprasad Kelam <hariprasad.kelam@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>