simplify code

Author: kkent030315

src/pe/tls.rs

@@ -219,12 +219,15 @@ impl<'a> TlsData<'a> {
             // VA to RVA
             let rva = itd.start_address_of_raw_data - image_base;
             let size = itd.end_address_of_raw_data - itd.start_address_of_raw_data;
+            let offset = utils::find_offset(rva as usize, sections, file_alignment, opts);
 
-            if let Some(offset) = utils::find_offset(rva as usize, sections, file_alignment, opts) {
+            raw_data = offset.and_then(|offset| {
                 if offset < bytes.len() {
-                    raw_data = (&bytes[offset..]).pread_with(0, size as usize).ok();
+                    (&bytes[offset..]).pread_with(0, size as usize).ok()
+                } else {
+                    None
                 }
-            }
+            });
         }
 
         // Parse the index if any