Fix infinite calibration (#1147)

* Fix infinite calibration

* fmt

* fix

* fix

libafl/src/stages/calibrate.rs

@@ -153,7 +153,7 @@ where
         let mut unstable_entries: Vec<usize> = vec![];
         let map_len: usize = map_first.len();
         // Run CAL_STAGE_START - 1 times, increase by 2 for every time a new
-        // run is found to be unstable, with CAL_STAGE_MAX total runs.
+        // run is found to be unstable or to crash with CAL_STAGE_MAX total runs.
         let mut i = 1;
         let mut has_errors = false;
 
@@ -178,11 +178,11 @@ where
                     )?;
 
                     has_errors = true;
+                }
+
                 if iter < CAL_STAGE_MAX {
                     iter += 2;
                 };
-                }
-                continue;
             };
 
             total_time += current_time() - start;