genesys: Return errors as exceptions from genesys_load_lut()

backend/genesys.cc

@@ -3378,7 +3378,6 @@ static SANE_Status
 genesys_start_scan (Genesys_Device * dev, SANE_Bool lamp_off)
 {
     DBG_HELPER(dbg);
-  SANE_Status status = SANE_STATUS_GOOD;
   unsigned int steps, expected;
   SANE_Bool empty;
 
@@ -3467,14 +3466,8 @@ genesys_start_scan (Genesys_Device * dev, SANE_Bool lamp_off)
   /* build look up table for dynamic lineart */
   if(dev->settings.dynamic_lineart==SANE_TRUE)
     {
-      status = sanei_genesys_load_lut(dev->lineart_lut, 8, 8, 50, 205,
-                        dev->settings.threshold_curve,
-                        dev->settings.threshold-127);
-      if (status != SANE_STATUS_GOOD)
-        {
-          DBG(DBG_error, "%s: failed to build lut\n", __func__);
-          return status;
-        }
+        sanei_genesys_load_lut(dev->lineart_lut, 8, 8, 50, 205, dev->settings.threshold_curve,
+                               dev->settings.threshold-127);
     }
 
     if (dev->model->cmd_set->wait_for_motor_stop) {

backend/genesys_low.cc

@@ -1715,17 +1715,12 @@ int sanei_genesys_compute_max_shift(Genesys_Device *dev,
   * @param slope slope of the generated data
   * @param offset offset of the generated data
   */
-SANE_Status
-sanei_genesys_load_lut (unsigned char * lut,
-                        int in_bits,
-                        int out_bits,
-                        int out_min,
-                        int out_max,
-                        int slope,
-                        int offset)
+void sanei_genesys_load_lut(unsigned char* lut,
+                            int in_bits, int out_bits,
+                            int out_min, int out_max,
+                            int slope, int offset)
 {
     DBG_HELPER(dbg);
-  SANE_Status ret = SANE_STATUS_GOOD;
   int i, j;
   double shift, rise;
   int max_in_val = (1 << in_bits) - 1;
@@ -1776,8 +1771,6 @@ sanei_genesys_load_lut (unsigned char * lut,
 	  lut_p16++;
 	}
     }
-
-  return ret;
 }
 
 void sanei_genesys_usleep(unsigned int useconds)

backend/genesys_low.h

@@ -2002,14 +2002,10 @@ int sanei_genesys_compute_max_shift(Genesys_Device *dev,
                                     int yres,
                                     int flags);
 
-extern SANE_Status
-sanei_genesys_load_lut (unsigned char * lut,
-                        int in_bits,
-                        int out_bits,
-                        int out_min,
-                        int out_max,
-                        int slope,
-                        int offset);
+extern void sanei_genesys_load_lut(unsigned char* lut,
+                                   int in_bits, int out_bits,
+                                   int out_min, int out_max,
+                                   int slope, int offset);
 
 extern void sanei_genesys_generate_gamma_buffer(Genesys_Device* dev,
                                     const Genesys_Sensor& sensor,