[3.0] e894769 Reapply f6f75eac to the right file

[Federico G. Schwindt]

commit e894769252da377a91ebb259ed46a5fc9d46e14b
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Tue Oct 27 18:15:36 2015 +0000

    Reapply f6f75eac to the right file

diff --git a/lib/libjemalloc/jemalloc_linux.c b/lib/libjemalloc/jemalloc_linux.c
index 170777b..1b68425 100644
--- a/lib/libjemalloc/jemalloc_linux.c
+++ b/lib/libjemalloc/jemalloc_linux.c
@@ -3929,6 +3929,7 @@ arena_dalloc(arena_t *arena, arena_chunk_t *chunk, void *ptr)
 					arena_dalloc_small(arena, chunk, ptr,
 					    mapelm);
 					malloc_spin_unlock(&arena->lock);
+					return;
 				}
 				mag_rack = rack;
 			}