Staging: rtl8723au: rtl8723a_rf6052: Remove unnecessary semicolon.

Remove unnecessary semicolon.

Coccinelle sementic patch as follows:
@r_case@
position p;
@@
switch (...)
{
case ...: ...;@p
}

@r_default@
position p;
@@
switch (...)
{
default: ...;@p
}

@r1@
statement S;
position p1;
position p != {r_case.p, r_default.p};
identifier label;
@@
(
label:;
|
S@p1;@p
)

Signed-off-by: Sandhya Bankar <bankarsandhya512@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>