Remove set but unused variables which cause compiler warnings

backend/artec_eplus48u.c

@@ -351,9 +351,6 @@ static void
 finish_shading_buffer (Artec48U_Scanner * s, SANE_Bool white)
 {
   unsigned int i, j, cnt, c, div;
-  unsigned long max_r;
-  unsigned long max_g;
-  unsigned long max_b;
   unsigned char *shading_buffer;
   cnt = 0;
 
@@ -379,18 +376,12 @@ finish_shading_buffer (Artec48U_Scanner * s, SANE_Bool white)
 	  ++cnt;
 	}
     }
-  max_r = 0;
-  max_g = 0;
-  max_b = 0;
 
   for (c = 0; c < (30720 * s->dev->epro_mult) - 5; c += 6) /*epro*/
     {
       i = (int) shading_buffer[c] + ((int) shading_buffer[c + 1] << 8);
-      max_r += i;
       i = (int) shading_buffer[c + 2] + ((int) shading_buffer[c + 3] << 8);
-      max_g += i;
       i = (int) shading_buffer[c + 4] + ((int) shading_buffer[c + 5] << 8);
-      max_b += i;
     }
 }
 

backend/dc25.c

@@ -925,7 +925,6 @@ adjust_color_and_saturation (short red[], short green[], short blue[])
   int line, column;
   int r_min = SMAX, g_min = SMAX, b_min = SMAX;
   int r_max = 0, g_max = 0, b_max = 0;
-  int r_sum = 0, g_sum = 0, b_sum = 0;
   float sqr_saturation = sqrt (saturation);
   for (line = TOP_MARGIN; line < HEIGHT - BOTTOM_MARGIN; line++)
     {
@@ -1008,9 +1007,6 @@ adjust_color_and_saturation (short red[], short green[], short blue[])
 	    g_max = g;
 	  if (b_max < b)
 	    b_max = b;
-	  r_sum += r;
-	  g_sum += g;
-	  b_sum += b;
 	  BIDIM_ARRAY (red, column, line, columns) = r;
 	  BIDIM_ARRAY (green, column, line, columns) = g;
 	  BIDIM_ARRAY (blue, column, line, columns) = b;
@@ -1153,7 +1149,6 @@ output_rgb (const short red[],
 {
   int r_min = 255, g_min = 255, b_min = 255;
   int r_max = 0, g_max = 0, b_max = 0;
-  int r_sum = 0, g_sum = 0, b_sum = 0;
   int column, line;
   unsigned char *gamma_table = make_gamma_table (high_i - low_i);
 
@@ -1202,19 +1197,9 @@ output_rgb (const short red[],
 	    g_max = g;
 	  if (b_max < b)
 	    b_max = b;
-	  r_sum += r;
-	  g_sum += g;
-	  b_sum += b;
 	}
     }
   free (gamma_table);
-/*
-	{
-		fprintf (stderr, "%s: output_rgb: r: min = %d, max = %d, ave = %d\n", __progname, r_min, r_max, r_sum / NET_PIXELS);
-		fprintf (stderr, "%s: output_rgb: g: min = %d, max = %d, ave = %d\n", __progname, g_min, g_max, g_sum / NET_PIXELS);
-		fprintf (stderr, "%s: output_rgb: b: min = %d, max = %d, ave = %d\n", __progname, b_min, b_max, b_sum / NET_PIXELS);
-	}
-*/
   return 0;
 }
 

backend/hp3500.c

@@ -1530,8 +1530,6 @@ rt_get_available_bytes (void)
 static int
 rt_get_data (int bytes, void *data)
 {
-  int total = 0;
-
   while (bytes)
     {
       int bytesnow = bytes;
@@ -1542,7 +1540,6 @@ rt_get_data (int bytes, void *data)
 	  (RTCMD_READBYTES, 0, bytesnow, 0, 0, bytesnow, data) < 0
 	  || rt_execute_commands () < 0)
 	return -1;
-      total += bytesnow;
       bytes -= bytesnow;
       data = (char *) data + bytesnow;
     }

backend/hp4200.c

@@ -941,7 +941,6 @@ compute_dpd (HP4200_Scanner * s, int step_size, int line_end)
 static SANE_Status
 read_required_bytes (HP4200_Scanner * s, int required, SANE_Byte * buffer)
 {
-  int read_count = 0;
   unsigned char scankb1;
   unsigned char scankb2;
   size_t to_read;
@@ -987,7 +986,6 @@ read_required_bytes (HP4200_Scanner * s, int required, SANE_Byte * buffer)
 	  buffer += really_read;
 	  required -= really_read;
 	  to_read -= really_read;
-	  read_count += really_read;
 	}
     }