uvc: parse debugfs params safely

server/src/bin/lesavka-uvc.rs

@@ -908,8 +908,14 @@ fn read_debugfs_fifos() -> Option<(Option<u32>, Option<u32>)> {
     let mut non_periodic: Option<u32> = None;
     for line in text.lines() {
         let mut parts = line.splitn(2, ':');
-        let key = parts.next()?.trim();
-        let val = parts.next()?.trim().parse::<u32>().ok()?;
+        let key = match parts.next() {
+            Some(v) => v.trim(),
+            None => continue,
+        };
+        let val = match parts.next().and_then(|v| v.trim().parse::<u32>().ok()) {
+            Some(v) => v,
+            None => continue,
+        };
         if key == "g_np_tx_fifo_size" {
             non_periodic = Some(val);
         } else if key.starts_with("g_tx_fifo_size[") && val > 0 {