[clang-tools-extra] [clang-doc] Refactor error handling to use ExitOnError (PR #141699)

[Paul Kirth via cfe-commits]

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@@ -371,22 +368,15 @@ Example usage for a project using a compile commands database:
   sortUsrToInfo(USRToInfo);
 
   // Ensure the root output directory exists.
-  if (std::error_code Err = llvm::sys::fs::create_directories(OutDirectory);
-      Err != std::error_code()) {
-    llvm::errs() << "Failed to create directory '" << OutDirectory << "'\n";
-    return 1;
+  if (std::error_code Err = llvm::sys::fs::create_directories(OutDirectory)) {
+    ExitOnErr(llvm::createFileError(OutDirectory, Err));
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ilovepi wrote:

A helper here may also make the usage nicer, similar to the above case.

https://github.com/llvm/llvm-project/pull/141699