[gegl] bump-map: remove pointless self-assignment

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 7cbf33db415004080910838622e31cd4a6780a07
Author: Øyvind Kolås <pippin gimp org>
Date:   Fri May 1 19:17:45 2020 +0200

    bump-map: remove pointless self-assignment
    
    Fixing issue #243.

 operations/common-gpl3+/bump-map.c | 3 ---
 1 file changed, 3 deletions(-)
---
diff --git a/operations/common-gpl3+/bump-map.c b/operations/common-gpl3+/bump-map.c
index 4ab1b4a16..c01a9251a 100644
--- a/operations/common-gpl3+/bump-map.c
+++ b/operations/common-gpl3+/bump-map.c
@@ -239,9 +239,6 @@ bumpmap_row (gfloat         *row,
             buf[b] = buf[b] * shade;
         }
 
-      if (params->in_has_alpha)
-        buf[3] = buf[3];
-
       buf += params->in_components;
     }
 }