[Crash-utility] [PATCH] avoid read_string() for no terminated buf.

Hi Dave, I met stack smashing detection by glibc at read_string() then this patch is proposal. *** stack smashing detected ***: crash terminated ======= Backtrace: ========= /lib/libc.so.6(__fortify_fail+0x4c)[0xfe12380] /lib/libc.so.6(__fortify_fail+0x0)[0xfe12334] ./crash[0x10147bf0] ./crash(display_sys_stats+0xcf8)[0x1011cd74] ./crash(main_loop+0x300)[0x10068960] ./crash(current_interp_command_loop+0x48)[0x1021ac2c] ./crash[0x1021bcc4] ./crash(catch_errors+0x84)[0x1021a0c4] ./crash[0x1021d37c] ./crash(catch_errors+0x84)[0x1021a0c4] ./crash(gdb_main+0x58)[0x1021d3e8] ./crash(gdb_main_entry+0x6c)[0x1021d490] ./crash(gdb_main_loop+0x3b4)[0x10130e5c] ./crash(main+0x38c0)[0x10068650] /lib/libc.so.6(+0x1f568)[0xfd36568] /lib/libc.so.6(+0x1f728)[0xfd36728] An failed vmalloc() including non terminated with NULLCHAR is root cause, but I think it is better to keep other utilities without killed. Thanks, Toshi