src: reduce variable scope in module_wrap.cc

PR-URL: #23297
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Gabriel Schulhof <gabriel.schulhof@intel.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

src/module_wrap.cc

@@ -433,16 +433,15 @@ std::string ReadFile(uv_file file) {
   uv_fs_t req;
   char buffer_memory[4096];
   uv_buf_t buf = uv_buf_init(buffer_memory, sizeof(buffer_memory));
-  int r;
 
   do {
-    r = uv_fs_read(uv_default_loop(),
-                   &req,
-                   file,
-                   &buf,
-                   1,
-                   contents.length(),  // offset
-                   nullptr);
+    const int r = uv_fs_read(uv_default_loop(),
+                             &req,
+                             file,
+                             &buf,
+                             1,
+                             contents.length(),  // offset
+                             nullptr);
     uv_fs_req_cleanup(&req);
 
     if (r <= 0)