media: s5k5baf: remove unnecessary static in s5k5baf_get_selection()

Remove unnecessary static on local variable rtype. Such variable
is initialized before being used, on every execution path throughout
the function. The static has no benefit and, removing it reduces
the code size.

This issue was detected using Coccinelle and the following semantic patch:

@bad exists@
position p;
identifier x;
type T;
@@

static T x@p;
...
x = <+...x...+>

@@
identifier x;
expression e;
type T;
position p != bad.p;
@@

-static
 T x@p;
 ... when != x
     when strict
?x = e;

In the following log you can see the difference in the code size. Also,
there is a significant difference in the bss segment. This log is the
output of the size command, before and after the code change:

before:
   text    data     bss     dec     hex filename
  27765    5656     320   33741    83cd drivers/media/i2c/s5k5baf.o

after:
   text    data     bss     dec     hex filename
  27733    5600     256   33589    8335 drivers/media/i2c/s5k5baf.o

Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>