[wls] return when a solution is found instead to reach max iter (#3617)

This bug is intruduced by #3320. Without the return, wls only ends after
reaching max_iter. In simulation, only 1 iteration is needed to reach a
solution in flight, while max iter is set to 10.

https://github.com/paparazzi/paparazzi/pull/3320/changes#diff-fd1514a7b2a74afb97095b63a4d2d7986c427e9d939db0a36eb68620d9e351c1R273

sw/airborne/math/wls/wls_alloc.c

@@ -264,13 +264,12 @@ void wls_alloc(struct WLS_t* WLS_p, float **B, float *u_guess, float *W_init, in
         }
       }
       if (break_flag) {
-
 #if WLS_VERBOSE
         print_final_values(WLS_p, B);
 #endif
-        
         // if solution is found, return number of iterations
         WLS_p->iter = iter;
+        return;
       }
     } else {
       // scaling back actuator command (0-1)