examples/rust: Do some simplification around unsafe {} blocks

We can put the unsafe keyword as part of the function definition,
getting rid of the unsafe {} blocks in the functions themselves.

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

Author: ac000

examples/rust/echo-request/src/lib.rs

@@ -17,17 +17,13 @@ use std::ptr::null_mut;
 static mut REQUEST_BUF: *mut u8 = null_mut();
 
 #[no_mangle]
-pub extern "C" fn uwr_module_end_handler() {
-    unsafe {
-        uwr_free(REQUEST_BUF);
-    }
+pub unsafe extern "C" fn uwr_module_end_handler() {
+    uwr_free(REQUEST_BUF);
 }
 
 #[no_mangle]
-pub extern "C" fn uwr_module_init_handler() {
-    unsafe {
-        REQUEST_BUF = uwr_malloc(uwr_mem_get_init_size());
-    }
+pub unsafe extern "C" fn uwr_module_init_handler() {
+    REQUEST_BUF = uwr_malloc(uwr_mem_get_init_size());
 }
 
 pub extern "C" fn hdr_iter_func(

examples/rust/large-upload/src/lib.rs

@@ -16,18 +16,18 @@ static mut REQUEST_BUF: *mut u8 = null_mut();
 static mut TOTAL_BYTES_WROTE: u64 = 0;
 
 #[no_mangle]
-pub extern "C" fn uwr_module_end_handler() {
-    unsafe { uwr_free(REQUEST_BUF); }
+pub unsafe extern "C" fn uwr_module_end_handler() {
+    uwr_free(REQUEST_BUF);
 }
 
 #[no_mangle]
-pub extern "C" fn uwr_module_init_handler() {
-    unsafe { REQUEST_BUF = uwr_malloc(uwr_mem_get_init_size()); }
+pub unsafe extern "C" fn uwr_module_init_handler() {
+    REQUEST_BUF = uwr_malloc(uwr_mem_get_init_size());
 }
 
 #[no_mangle]
-pub extern "C" fn uwr_response_end_handler() {
-    unsafe { TOTAL_BYTES_WROTE = 0; }
+pub unsafe extern "C" fn uwr_response_end_handler() {
+    TOTAL_BYTES_WROTE = 0;
 }
 
 #[no_mangle]

examples/rust/upload-reflector/src/lib.rs

@@ -18,22 +18,18 @@ static mut TOTAL_RESPONSE_SENT: usize = 0;
 static mut REQUEST_BUF: *mut u8 = null_mut();
 
 #[no_mangle]
-pub extern "C" fn uwr_response_end_handler() {
-    unsafe {
-        TOTAL_RESPONSE_SENT = 0;
-    }
+pub unsafe extern "C" fn uwr_response_end_handler() {
+    TOTAL_RESPONSE_SENT = 0;
 }
 
 #[no_mangle]
-pub extern "C" fn uwr_request_end_handler() {
-    unsafe {
-        if REQUEST_BUF.is_null() {
-            return;
-        }
-
-        uwr_free(REQUEST_BUF);
-        REQUEST_BUF = null_mut();
+pub unsafe extern "C" fn uwr_request_end_handler() {
+    if REQUEST_BUF.is_null() {
+        return;
     }
+
+    uwr_free(REQUEST_BUF);
+    REQUEST_BUF = null_mut();
 }
 
 pub fn upload_reflector(ctx: *mut luw_ctx_t) -> i32 {