fix(qsv): end the inner borrow before the retarget param rebuild

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

crates/pf-encode/src/enc/windows/qsv.rs

@@ -1401,6 +1401,10 @@ impl Encoder for QsvEncoder {
     /// requires completed sync operations, so the in-flight window is drained (into `ready`)
     /// first; a drain that can't finish inside the budget falls back to the caller's rebuild.
     fn reconfigure_bitrate(&mut self, bps: u64) -> bool {
+        // Drain phase in its own scope so the `inner` borrow ends before the param rebuild
+        // below reads `self` again (the raw session pointer stays valid — `self.inner` is not
+        // touched in between).
+        let session = {
             let Some(inner) = self.inner.as_mut() else {
                 self.bitrate_bps = bps;
                 return true;
@@ -1425,6 +1429,8 @@ impl Encoder for QsvEncoder {
                     }
                 }
             }
+            inner.session.0
+        };
         let old = self.bitrate_bps;
         self.bitrate_bps = bps;
         let cfg = self.encode_config();
@@ -1441,7 +1447,7 @@ impl Encoder for QsvEncoder {
         set.par.NumExtParam = set.ptrs.len() as u16;
         // SAFETY: session live on this thread, no operation in flight (drained above); the
         // param block + ext chain outlive the synchronous call.
-        let sts = unsafe { vpl::MFXVideoENCODE_Reset(inner.session.0, &mut set.par) };
+        let sts = unsafe { vpl::MFXVideoENCODE_Reset(session, &mut set.par) };
         if sts < vpl::MFX_ERR_NONE {
             tracing::warn!(
                 mbps = bps / 1_000_000,