staging: rtl8723bs: hal: rtl8723b_hal_init: fix Comparison to NULL

This patch tries to fix below issues reported by checkpatch

CHECK: Comparison to NULL could be written "!efuseTbl"
CHECK: Comparison to NULL could be written "!psta"

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