audioloudnorm: Clamp to the expected limits instead of asserting

The calculations on the floating point numbers can't get out of the
expected range by construction expect for rounding errors at the limits.
Rounding errors at the limits shouldn't lead to assertions, so instead
clamp to the limits.

audio/audiofx/src/audioloudnorm/imp.rs

@@ -1028,7 +1028,7 @@ impl State {
                     // Calculate at which point we would reach the new gain reduction
                     // relative to 0.0 == attack window start, 1.0 attack window end.
                     let new_end = (gain_reduction - self.gain_reduction[0]) / old_slope;
-                    assert!(new_end >= 1.0);
+                    let new_end = f64::max(new_end, 1.0);
 
                     // New start of the window, this will be in the past
                     let new_start = new_end - 1.0;
@@ -1049,7 +1049,7 @@ impl State {
 
                     // Calculate the current position in the attack window
                     let cur_pos = (current_gain_reduction - self.gain_reduction[0]) / old_slope;
-                    assert!((0.0..=1.0).contains(&cur_pos));
+                    let cur_pos = f64::clamp(cur_pos, 0.0, 1.0);
                     self.env_cnt = ((LIMITER_ATTACK_WINDOW as f64 - 1.0) * cur_pos) as usize;
 
                     // Need to sustain in any case for this many samples to actually