drm/panic: prefer eliding lifetimes

Eliding lifetimes when possible instead of specifying them directly is
both shorter and easier to read. Clippy notes this in the
`needless_lifetimes` lint:

    error: the following explicit lifetimes could be elided: 'b
       --> drivers/gpu/drm/drm_panic_qr.rs:479:16
        |
    479 |     fn new<'a, 'b>(segments: &[&Segment<'b>], data: &'a mut [u8]) -> Option<EncodedMsg<'a>> {
        |                ^^                       ^^
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes
        = note: `-D clippy::needless-lifetimes` implied by `-D warnings`
        = help: to override `-D warnings` add `#[allow(clippy::needless_lifetimes)]`
    help: elide the lifetimes
        |
    479 -     fn new<'a, 'b>(segments: &[&Segment<'b>], data: &'a mut [u8]) -> Option<EncodedMsg<'a>> {
    479 +     fn new<'a>(segments: &[&Segment<'_>], data: &'a mut [u8]) -> Option<EncodedMsg<'a>> {
        |

Remove the explicit lifetime annotation in favour of an elided lifetime.

Fixes: cb5164a ("drm/panic: Add a QR code panic screen")
Reported-by: Miguel Ojeda <ojeda@kernel.org>
Link: #1123
Signed-off-by: Thomas Böhler <witcher@wiredspace.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://lore.kernel.org/r/20241019084048.22336-4-witcher@wiredspace.de
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: Witcher01

drivers/gpu/drm/drm_panic_qr.rs

@@ -476,7 +476,7 @@ struct EncodedMsg<'a> {
 /// Data to be put in the QR code, with correct segment encoding, padding, and
 /// Error Code Correction.
 impl EncodedMsg<'_> {
-    fn new<'a, 'b>(segments: &[&Segment<'b>], data: &'a mut [u8]) -> Option<EncodedMsg<'a>> {
+    fn new<'a>(segments: &[&Segment<'_>], data: &'a mut [u8]) -> Option<EncodedMsg<'a>> {
         let version = Version::from_segments(segments)?;
         let ec_size = version.ec_size();
         let g1_blocks = version.g1_blocks();