bcm2708_fb: remove unnecessary initialization of result

static analysis by cppcheck detected an unnecessary initialization
of variable 'result' which is re-assigned almost immediately after
the initialization.  Remove the redundant initialization.

[drivers/video/fbdev/bcm2708_fb.c:406]: (performance) Variable
  'result' is reassigned a value before the old one has been used.

Signed-off-by: Colin Ian King <colin.king@canonical.com>

drivers/video/fbdev/bcm2708_fb.c

@@ -420,7 +420,7 @@ static int bcm2708_fb_blank(int blank_mode, struct fb_info *info)
 
 static int bcm2708_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
 {
-	s32 result = -1;
+	s32 result;
 	info->var.xoffset = var->xoffset;
 	info->var.yoffset = var->yoffset;
 	result = bcm2708_fb_set_par(info);