[PATCH] gdb/nat/linux-osdata.c: fix build on gcc-12 (string overfow)

[Sergei Trofimovich]

From: Sergei Trofimovich <siarheit@google.com>

On gcc-12 build fails as:

    gdbserver/../gdb/nat/linux-osdata.c: In function 'void linux_xfer_osdata_processes(buffer*)':
    gdbserver/../gdb/nat/linux-osdata.c:330:39: error:
      '__builtin___sprintf_chk' may write a terminating nul past the end of the destination [-Werror=format-overflow=]
      330 |                 sprintf (core_str, "%d", i);
          |                                       ^

It's an off-by-one case in an unlinely scenario for negative
huge core count. The change assumes smalles negative value to
include sign.
---
 gdb/nat/linux-osdata.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gdb/nat/linux-osdata.c b/gdb/nat/linux-osdata.c
index 9746d1210fe..18b6f40cb78 100644
--- a/gdb/nat/linux-osdata.c
+++ b/gdb/nat/linux-osdata.c
@@ -320,12 +320,12 @@ linux_xfer_osdata_processes (struct buffer *buffer)
 	  /* Find CPU cores used by the process.  */
 	  cores = XCNEWVEC (int, num_cores);
 	  task_count = get_cores_used_by_process (pid, cores, num_cores);
-	  cores_str = (char *) xcalloc (task_count, sizeof ("4294967295") + 1);
+	  cores_str = (char *) xcalloc (task_count, sizeof ("-2147483648") + 1);
 
 	  for (i = 0; i < num_cores && task_count > 0; ++i)
 	    if (cores[i])
 	      {
-		char core_str[sizeof ("4294967295")];
+		char core_str[sizeof ("-2147483648")];
 
 		sprintf (core_str, "%d", i);
 		strcat (cores_str, core_str);
-- 
2.33.1