staging: rtl8723bs: Fix Indentation Error: code indent should use tabs where possible

Resolve indentation errors which were caused by a mix of space and tabs
for indentation. Previous patch to fix if-else brace styles revealed
the indentation error
Signed-off-by: Shobhit Kukreti <shobhitkukreti@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>