Cleanup: Modifiers, Clang-Tidy else-after-return fixes

This addresses warnings from Clang-Tidy's `readability-else-after-return`
rule in the `source/blender/modifiers` module.

No functional changes.

source/blender/modifiers/intern/MOD_util.c

@@ -143,10 +143,9 @@ void MOD_get_texture_coords(MappingInfoModifierData *dmd,
       MEM_freeN(done);
       return;
     }
-    else {
-      /* if there are no UVs, default to local */
-      texmapping = MOD_DISP_MAP_LOCAL;
-    }
+
+    /* if there are no UVs, default to local */
+    texmapping = MOD_DISP_MAP_LOCAL;
   }
 
   MVert *mv = mesh->mvert;