vulkan: fix double dlopen for layer libraries

Bug: 28826014
Change-Id: I10693426f987e63bb490ac8d1f4445ce2d195d8d
diff --git a/vulkan/libvulkan/layers_extensions.cpp b/vulkan/libvulkan/layers_extensions.cpp
index 4505f41..aa35657 100644
--- a/vulkan/libvulkan/layers_extensions.cpp
+++ b/vulkan/libvulkan/layers_extensions.cpp
@@ -121,7 +121,6 @@
         } else {
             dlhandle_ = dlopen(path_.c_str(), RTLD_NOW | RTLD_LOCAL);
         }
-        dlhandle_ = dlopen(path_.c_str(), RTLD_NOW | RTLD_LOCAL);
         if (!dlhandle_) {
             ALOGE("failed to load layer library '%s': %s", path_.c_str(),
                   dlerror());