<rdar://problem/10652336>

Fixed a crasher when trying to load an expression prefix file:

% touch /tmp/carp.txt
% xcrun lldb
(lldb) settings set target.expr-prefix /tmp/carp.txt
Segmentation fault

llvm-svn: 147646
diff --git a/lldb/source/Core/Section.cpp b/lldb/source/Core/Section.cpp
index b8b9ddf..09394b2 100644
--- a/lldb/source/Core/Section.cpp
+++ b/lldb/source/Core/Section.cpp
@@ -339,7 +339,7 @@
             if (section_offset < file_size)
             {
                 off_t section_file_offset = objfile->GetOffset() + GetFileOffset() + section_offset;
-                bytes_read = file.ReadFileContents (section_file_offset, dst, dst_len);
+                bytes_read = file.ReadFileContents (section_file_offset, dst, dst_len, NULL);
                 if (bytes_read >= dst_len)
                     return bytes_read;
                 bytes_left -= bytes_read;