Auto-fix clippy::collapsible_if violations (#36428)

Release Notes:

- N/A

crates/zlog/src/sink.rs

@@ -194,10 +194,10 @@ pub fn flush() {
         ENABLED_SINKS_FILE.clear_poison();
         handle.into_inner()
     });
-    if let Some(file) = file.as_mut() {
-        if let Err(err) = file.flush() {
-            eprintln!("Failed to flush log file: {}", err);
-        }
+    if let Some(file) = file.as_mut()
+        && let Err(err) = file.flush()
+    {
+        eprintln!("Failed to flush log file: {}", err);
     }
 }
 

crates/zlog/src/zlog.rs

@@ -28,10 +28,8 @@ pub fn try_init() -> anyhow::Result<()> {
 }
 
 pub fn init_test() {
-    if get_env_config().is_some() {
-        if try_init().is_ok() {
-            init_output_stdout();
-        }
+    if get_env_config().is_some() && try_init().is_ok() {
+        init_output_stdout();
     }
 }
 
@@ -344,18 +342,18 @@ impl Timer {
             return;
         }
         let elapsed = self.start_time.elapsed();
-        if let Some(warn_limit) = self.warn_if_longer_than {
-            if elapsed > warn_limit {
-                crate::warn!(
-                    self.logger =>
-                    "Timer '{}' took {:?}. Which was longer than the expected limit of {:?}",
-                    self.name,
-                    elapsed,
-                    warn_limit
-                );
-                self.done = true;
-                return;
-            }
+        if let Some(warn_limit) = self.warn_if_longer_than
+            && elapsed > warn_limit
+        {
+            crate::warn!(
+                self.logger =>
+                "Timer '{}' took {:?}. Which was longer than the expected limit of {:?}",
+                self.name,
+                elapsed,
+                warn_limit
+            );
+            self.done = true;
+            return;
         }
         crate::trace!(
             self.logger =>