fmt and fix clippy

Author: Firestar99

src/allocator/dedicated_block_allocator/mod.rs

@@ -108,7 +108,7 @@ impl SubAllocator for DedicatedBlockAllocator {
             name,
             self.backtrace
                 .as_ref()
-                .map_or(&Backtrace::disabled(), |b| &b)
+                .map_or(&Backtrace::disabled(), |b| b)
         )
     }
 

src/allocator/free_list_allocator/mod.rs

@@ -384,7 +384,10 @@ impl SubAllocator for FreeListAllocator {
                 chunk.offset,
                 chunk.allocation_type,
                 name,
-                chunk.backtrace.as_ref().map_or(&Backtrace::disabled(), |b| &b)
+                chunk
+                    .backtrace
+                    .as_ref()
+                    .map_or(&Backtrace::disabled(), |b| b)
             );
         }
     }