[gegl] shadows-highlights-correction: Silence -Wunused-variable

[Debarshi Ray <debarshir src gnome org>]

commit 72c5d4440ac999222474e00f855c8c5f1f377488
Author: Debarshi Ray <debarshir gnome org>
Date:   Fri Oct 27 11:39:14 2017 +0200

    shadows-highlights-correction: Silence -Wunused-variable

 .../workshop/shadows-highlights-correction.c       |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/operations/workshop/shadows-highlights-correction.c 
b/operations/workshop/shadows-highlights-correction.c
index 4a83b57..4cf27d9 100644
--- a/operations/workshop/shadows-highlights-correction.c
+++ b/operations/workshop/shadows-highlights-correction.c
@@ -95,7 +95,6 @@ process (GeglOperation       *operation,
 
   gfloat max[4] = { 1.0f, 1.0f, 1.0f, 1.0f };
   gfloat min[4] = { 0.0f, -1.0f, -1.0f, 0.0f };
-  gfloat lmin = 0.0f;
   gfloat lmax = max[0] + fabs(min[0]);
   gfloat halfmax = lmax / 2.0;
   gfloat doublemax = lmax * 2.0;