ReadPadSegmentNote(): improve error message.

We're _looking_ for an NT_ANDROID_TYPE_PAD_SEGMENT note, but when we're reporting a structural problem with the ELF file we don't actually know what kind of note we'd be looking at were we to risk trying to decode it.

Bug: http://b/390328213
Change-Id: I702939d0d489d8f252783544db7b6b8186d67b96
diff --git a/linker/linker_phdr.cpp b/linker/linker_phdr.cpp
index 2eadbf9..db9b416 100644
--- a/linker/linker_phdr.cpp
+++ b/linker/linker_phdr.cpp
@@ -779,7 +779,7 @@
         continue;
       }
 
-      DL_ERR_AND_LOG("\"%s\": NT_ANDROID_TYPE_PAD_SEGMENT note runs off end of file", name_.c_str());
+      DL_ERR_AND_LOG("\"%s\": ELF note (phdr %zu) runs off end of file", name_.c_str(), i);
       return false;
     }