perf build-id: Ensure snprintf string is empty when size is 0

JIRA: https://issues.redhat.com/browse/RHEL-78200

upstream
========
commit 0dc96ca
Author: Ian Rogers <irogers@google.com>
Date: Thu Sep 18 10:24:16 2025 -0700

description
===========
The string result of build_id__snprintf() is unconditionally used in
places like dsos__fprintf_buildid_cb(). If the build id has size 0 then
this creates a use of uninitialized memory. Add null termination for the
size 0 case.

A similar fix was written by Jiri Olsa in commit 6311951 ("perf
tools: Initialize output buffer in build_id__sprintf") but lost in the
transition to snprintf.

Fixes: fccaaf6 ("perf build-id: Change sprintf functions to snprintf")
    Signed-off-by: Ian Rogers <irogers@google.com>
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: Howard Chu <howardchu95@gmail.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: James Clark <james.clark@linaro.org>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: Kan Liang <kan.liang@linux.intel.com>
    Cc: Mark Rutland <mark.rutland@arm.com>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Signed-off-by: Anubhav Shelat <ashelat@redhat.com>

Author: AnubhavS1

tools/perf/util/build-id.c

@@ -86,6 +86,13 @@ int build_id__snprintf(const struct build_id *build_id, char *bf, size_t bf_size
 {
 	size_t offs = 0;
 
+	if (build_id->size == 0) {
+		/* Ensure bf is always \0 terminated. */
+		if (bf_size > 0)
+			bf[0] = '\0';
+		return 0;
+	}
+
 	for (size_t i = 0; i < build_id->size && offs < bf_size; ++i)
 		offs += snprintf(bf + offs, bf_size - offs, "%02x", build_id->data[i]);