bpftool: Fix -Wuninitialized-const-pointer warnings with clang >= 21

This fixes the build with -Werror -Wall.

btf_dumper.c:71:31: error: variable 'finfo' is uninitialized when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer]
   71 |         info.func_info = ptr_to_u64(&finfo);
      |                                      ^~~~~

prog.c:2294:31: error: variable 'func_info' is uninitialized when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer]
 2294 |         info.func_info = ptr_to_u64(&func_info);
      |

Signed-off-by: Tom Stellard <[email protected]>

Author: tstellar

tools/bpf/bpftool/btf_dumper.c

@@ -68,6 +68,8 @@ static int dump_prog_id_as_func_ptr(const struct btf_dumper *d,
 	memset(&info, 0, sizeof(info));
 	info.nr_func_info = 1;
 	info.func_info_rec_size = finfo_rec_size;
+	/* Silence -Wuninitialized-const-pointer warning in clang >= 21. */
+	memset(&finfo,  0, sizeof(finfo));
 	info.func_info = ptr_to_u64(&finfo);
 
 	err = bpf_prog_get_info_by_fd(prog_fd, &info, &info_len);

tools/bpf/bpftool/prog.c

@@ -2291,6 +2291,8 @@ static char *profile_target_name(int tgt_fd)
 	memset(&info, 0, sizeof(info));
 	info.nr_func_info = 1;
 	info.func_info_rec_size = func_info_rec_size;
+	/* Silence -Wuninitialized-const-pointer warning in clang >= 21. */
+	memset(&func_info,  0, sizeof(func_info));
 	info.func_info = ptr_to_u64(&func_info);
 
 	err = bpf_prog_get_info_by_fd(tgt_fd, &info, &info_len);