Fix read error on objects with no .text section (#67)

* Fix read error on objects with no .text section

* Fix read error on DWARF 1.1 objects

* Revert DWARF 1 changes

---------

Co-authored-by: Luke Street <[email protected]>

Author: AetiasHax

objdiff-core/src/obj/read.rs

@@ -328,15 +328,10 @@ fn line_info(obj_file: &File<'_>, sections: &mut [ObjSection]) -> Result<()> {
             if let Some(program) = unit.line_program.clone() {
                 let mut text_sections =
                     obj_file.sections().filter(|s| s.kind() == SectionKind::Text);
-                let section_index = text_sections
-                    .next()
-                    .ok_or_else(|| anyhow!("Next text section not found for line info"))?
-                    .index()
-                    .0;
-                let mut lines = sections
-                    .iter_mut()
-                    .find(|s| s.orig_index == section_index)
-                    .map(|s| &mut s.line_info);
+                let section_index = text_sections.next().map(|s| s.index().0);
+                let mut lines = section_index.map(|index| {
+                    &mut sections.iter_mut().find(|s| s.orig_index == index).unwrap().line_info
+                });
 
                 let mut rows = program.rows();
                 while let Some((_header, row)) = rows.next_row()? {