[glibc] stdio-common: Fix tst-setvbuf2.c on clang-23

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=06659e7cb19d5b06c726c10fd1aa7baf02d41d08

commit 06659e7cb19d5b06c726c10fd1aa7baf02d41d08
Author: Adhemerval Zanella <[email protected]>
Date:   Tue Aug 11 14:14:59 2026 -0300

    stdio-common: Fix tst-setvbuf2.c on clang-23
    
    clang-23 enables -Wunused-but-set-global by default, which flags
    variables that are set but never read.  Also remove the fstat call,
    which was only used to set the removed variable.

Diff:
---
 stdio-common/tst-setvbuf2.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/stdio-common/tst-setvbuf2.c b/stdio-common/tst-setvbuf2.c
index 1c1018796d..4f88091278 100644
--- a/stdio-common/tst-setvbuf2.c
+++ b/stdio-common/tst-setvbuf2.c
@@ -94,11 +94,6 @@ dumpfp (FILE *fp)
 # define dumpfp(FP)
 #endif
 
-#ifndef INDEPENDENT_PART
-/* st_blksize value for that file, or BUFSIZ if out of range.  */
-static int blksize = BUFSIZ;
-#endif
-
 /* Our test buffer.  */
 #define TEST_BUFSIZE 42
 static int bufsize = TEST_BUFSIZE < BUFSIZ ? TEST_BUFSIZE : BUFSIZ;
@@ -210,10 +205,6 @@ prepare_test_data (void)
       debug;
       int fd = create_temp_file ("tst-setvbuf2", &test_file_name);
       TEST_VERIFY_EXIT (fd != -1);
-      struct stat64 st;
-      xfstat64 (fd, &st);
-      if (st.st_blksize > 0 && st.st_blksize < BUFSIZ)
-	blksize = st.st_blksize;
       xclose (fd);
     }
 #endif