ksud: Fix elided lifetime has a name warning

Compilation log showing:

   --> src/sepolicy.rs:170:41
    |
169 | impl<'a> SeObjectParser<'a> for NormalPerm<'a> {
    |      -- lifetime `'a` declared here
170 |     fn parse(input: &'a str) -> IResult<&str, Self> {
    |                                         ^ this elided lifetime gets resolved as `'a`
    |
    = note: `#[warn(elided_named_lifetimes)]` on by default

Signed-off-by: rsuntk <rissu.ntk@gmail.com>

userspace/ksud/src/sepolicy.rs

@@ -167,7 +167,7 @@ enum PolicyStatement<'a> {
 }
 
 impl<'a> SeObjectParser<'a> for NormalPerm<'a> {
-    fn parse(input: &'a str) -> IResult<&str, Self> {
+    fn parse(input: &'a str) -> IResult<&'a str, Self> {
         let (input, op) = alt((
             tag("allow"),
             tag("deny"),