Clean up some redundant casts

src/api.rs

@@ -60,7 +60,7 @@ pub(crate) unsafe fn yaml_string_extend(
         new_start.wrapping_offset((*end).c_offset_from(*start) as libc::c_long as isize)
             as *mut libc::c_void,
         0,
-        (*end).c_offset_from(*start) as libc::c_long as libc::c_ulong,
+        (*end).c_offset_from(*start) as libc::c_ulong,
     );
     *pointer = new_start.wrapping_offset((*pointer).c_offset_from(*start) as libc::c_long as isize);
     *end = new_start.wrapping_offset(
@@ -88,7 +88,7 @@ pub(crate) unsafe fn yaml_string_join(
     memcpy(
         *a_pointer as *mut libc::c_void,
         *b_start as *const libc::c_void,
-        (*b_pointer).c_offset_from(*b_start) as libc::c_long as libc::c_ulong,
+        (*b_pointer).c_offset_from(*b_start) as libc::c_ulong,
     );
     *a_pointer =
         (*a_pointer).wrapping_offset((*b_pointer).c_offset_from(*b_start) as libc::c_long as isize);
@@ -149,7 +149,7 @@ pub(crate) unsafe fn yaml_queue_extend(
                 *start,
                 *head,
                 (*tail as *mut libc::c_char).c_offset_from(*head as *mut libc::c_char)
-                    as libc::c_long as libc::c_ulong,
+                    as libc::c_ulong,
             );
         }
         *tail = (*start as *mut libc::c_char).wrapping_offset(

src/dumper.rs

@@ -118,14 +118,14 @@ pub unsafe fn yaml_emitter_dump(
                 *fresh1 = yaml_malloc(
                     (size_of::<yaml_anchors_t>() as libc::c_ulong)
                         .force_mul((*document).nodes.top.c_offset_from((*document).nodes.start)
-                            as libc::c_long as libc::c_ulong),
+                            as libc::c_ulong),
                 ) as *mut yaml_anchors_t;
                 memset(
                     (*emitter).anchors as *mut libc::c_void,
                     0,
                     (size_of::<yaml_anchors_t>() as libc::c_ulong)
                         .force_mul((*document).nodes.top.c_offset_from((*document).nodes.start)
-                            as libc::c_long as libc::c_ulong),
+                            as libc::c_ulong),
                 );
                 memset(
                     event as *mut libc::c_void,

src/emitter.rs

@@ -1405,7 +1405,7 @@ unsafe fn yaml_emitter_analyze_tag(emitter: *mut yaml_emitter_t, tag: *mut yaml_
             let fresh49 = addr_of_mut!((*emitter).tag_data.suffix);
             *fresh49 = string.start.wrapping_offset(prefix_length as isize);
             (*emitter).tag_data.suffix_length = (string.end.c_offset_from(string.start)
-                as libc::c_long as libc::c_ulong)
+                as libc::c_ulong)
                 .wrapping_sub(prefix_length);
             return OK;
         }

src/scanner.rs

@@ -363,10 +363,9 @@ unsafe fn yaml_parser_save_simple_key(parser: *mut yaml_parser_t) -> Success {
         let simple_key = yaml_simple_key_t {
             possible: true,
             required,
-            token_number: (*parser)
-                .tokens_parsed
-                .force_add((*parser).tokens.tail.c_offset_from((*parser).tokens.head)
-                    as libc::c_long as libc::c_ulong),
+            token_number: (*parser).tokens_parsed.force_add(
+                (*parser).tokens.tail.c_offset_from((*parser).tokens.head) as libc::c_ulong,
+            ),
             mark: (*parser).mark,
         };
         if yaml_parser_remove_simple_key(parser).fail {