Allow None section when parsing line info

Fixes an error upon ending the last DWARF sequence

Author: AetiasHax

objdiff-core/src/obj/read.rs

@@ -346,15 +346,14 @@ fn line_info(obj_file: &File<'_>, sections: &mut [ObjSection]) -> Result<()> {
                     if row.end_sequence() {
                         // The next row is the start of a new sequence, which means we must
                         // advance to the next .text section.
-                        let section_index = text_sections
-                            .next()
-                            .ok_or_else(|| anyhow!("Next text section not found for line info"))?
-                            .index()
-                            .0;
-                        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);
+                        lines = section_index.map(|index| {
+                            &mut sections
+                                .iter_mut()
+                                .find(|s| s.orig_index == index)
+                                .unwrap()
+                                .line_info
+                        });
                     }
                 }
             }