staging: easycap: easycap.h use indentation for first level

replace
struct {
int a;
}

with  more readable

struct {
	int a;
}

Cc: Mike Thomas <rmthomas@sciolus.org>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>