input/trace32_ad: fix potential buffer overflow for unexpected input data

Commit 8c4bff1d25 introduced a routine which prints what mostly should
be text, and avoids non-printable characters. This implementation used an
incorrect format string, which could result in data getting written past
the end of a buffer. Fix the format string.

src/input/trace32_ad.c

@@ -120,7 +120,7 @@ static char *printable_name(const char *name)
 		if (g_ascii_isprint(name[i])) {
 			*p++ = name[i];
 		} else {
-			snprintf(p, 5, "\\x%05x", name[i]);
+			snprintf(p, 5, "\\x%02x", name[i]);
 			p += strlen("\\x00");
 		}
 	}