fix variable does not need to be mutable by shadowing

Signed-off-by: VGalaxies <[email protected]>

Author: VGalaxies

src/profiler.rs

@@ -487,16 +487,16 @@ impl Profiler {
         let handler = signal::SigHandler::SigAction(perf_signal_handler);
         // SA_RESTART will only restart a syscall when it's safe to do so,
         // e.g. when it's a blocking read(2) or write(2). See man 7 signal.
-        let mut flags = signal::SaFlags::SA_SIGINFO | signal::SaFlags::SA_RESTART;
+        let flags = signal::SaFlags::SA_SIGINFO | signal::SaFlags::SA_RESTART;
         #[cfg(feature = "frame-pointer")]
-        {
-            if self.on_stack {
-                // SA_ONSTACK will deliver the signal on an alternate stack. This is crucial
-                // to prevent a stack overflow if the signal arrives at a thread with
-                // a small stack, which is common when use pprof-rs in Go runtimes.
-                flags |= signal::SaFlags::SA_ONSTACK;
-            }
-        }
+        let flags = if self.on_stack {
+            // SA_ONSTACK will deliver the signal on an alternate stack. This is crucial
+            // to prevent a stack overflow if the signal arrives at a thread with
+            // a small stack, which is common when use pprof-rs in Go runtimes.
+            flags | signal::SaFlags::SA_ONSTACK
+        } else {
+            flags
+        };
         let sigaction = signal::SigAction::new(handler, flags, signal::SigSet::empty());
         let old_action = unsafe { signal::sigaction(signal::SIGPROF, &sigaction) }?;
         self.old_sigaction = Some(old_action);