[SPARK-52792][CORE][FOLLOWUP] Remove redundant condition check

### What changes were proposed in this pull request?

This PR is a follow-up to clean up a redundant condition check.

### Why are the changes needed?

To remove a redundant condition
- https://github.com/apache/spark/pull/51476/files#r2209040510

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Pass the CIs.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes #51524 from dongjoon-hyun/SPARK-52792.

Authored-by: Dongjoon Hyun <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

Author: dongjoon-hyun

common/network-common/src/main/java/org/apache/spark/network/server/TransportServer.java

@@ -105,7 +105,7 @@ private void init(String hostToBind, int portToBind) {
       conf.getModuleName() + "-server");
 
     String name = System.getProperty("os.name");
-    boolean isNotWindows = 7 > name.length() || !name.regionMatches(true, 0, "Windows", 0, 7);
+    boolean isNotWindows = !name.regionMatches(true, 0, "Windows", 0, 7);
     bootstrap = new ServerBootstrap()
       .group(bossGroup, workerGroup)
       .channel(NettyUtils.getServerChannelClass(ioMode))