checkasm/sw_rgb: fix the function declaration warning

fix the warning: "function declaration isn’t a prototype", in C
int foo() and int foo(void) are different functions. int foo()
accepts an arbitrary number of arguments, while int foo(void) accepts 0
arguments.
Signed-off-by: Jun Zhao <mypopydev@gmail.com>

tests/checkasm/sw_rgb.c

@@ -68,7 +68,7 @@ static void check_shuffle_bytes(void * func, const char * report)
     }
 }
 
-static void check_uyvy_to_422p()
+static void check_uyvy_to_422p(void)
 {
     int i;