Exit normally when packing relocs saves no space.

Bug: http://b/18051137
Change-Id: I43ea5678a677e5d39fb54fafcf3a2f3a252c79b0
diff --git a/tools/relocation_packer/src/elf_file.cc b/tools/relocation_packer/src/elf_file.cc
index 11af9ed..fb74233 100644
--- a/tools/relocation_packer/src/elf_file.cc
+++ b/tools/relocation_packer/src/elf_file.cc
@@ -666,7 +666,7 @@
 
   if (hole_size <= 0) {
     LOG(INFO) << "Packing relocations saves no space";
-    return false;
+    return true;
   }
 
   size_t data_padding_bytes = is_padding_relocations_ ?