glsl_to_tgsi: Fix potential leak

Reported by Coverity: arr_live_ranges is freed in a different branch
than the one in which it was allocated.

Signed-off-by: Ernestas Kulik <ernestas.kulik@gmail.com>
Signed-off-by: Marek Olšák <marek.olsak@amd.com>

src/mesa/state_tracker/st_glsl_to_tgsi.cpp

@@ -5616,10 +5616,11 @@ glsl_to_tgsi_visitor::merge_registers(void)
 
       this->next_array =  merge_arrays(this->next_array, this->array_sizes,
 				       &this->instructions, arr_live_ranges);
-
-      if (arr_live_ranges)
-	 delete[] arr_live_ranges;
    }
+
+   if (arr_live_ranges)
+      delete[] arr_live_ranges;
+
    ralloc_free(reg_live_ranges);
 }