out of bounds heap read in r_wstr_clen

[hannob]

This script will cause a heap oob:
https://crashes.fuzzing-project.org/radare2-oob-heap-read-r_wstr_clen

Test with (needs a real elf file):
radare2 -q -i [script] [elf_file]
Contains the commands aa and pffZ. Found with american fuzzy lop.

Address Sanitizer trace:

==9974==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x604000028a3b at pc 0x7f344a3d5df0 bp 0x7ffcf1fa1120 sp 0x7ffcf1fa1110
READ of size 1 at 0x604000028a3b thread T0
    #0 0x7f344a3d5def in r_wstr_clen /f/radare2/radare2/libr/util/str.c:1050
    #1 0x7f344a48436c in r_print_format /f/radare2/radare2/libr/util/p_format.c:1380
    #2 0x7f344f6a57da in cmd_print_format /f/radare2/radare2/libr/core/cmd_print.c:517
    #3 0x7f344f6a57da in cmd_print /f/radare2/radare2/libr/core/cmd_print.c:2840
    #4 0x7f344f70573a in r_core_cmd_subst_i /f/radare2/radare2/libr/core/cmd.c:1590
    #5 0x7f344f6668c4 in r_core_cmd_subst /f/radare2/radare2/libr/core/cmd.c:1081
    #6 0x7f344f667aa3 in r_core_cmd /f/radare2/radare2/libr/core/cmd.c:1938
    #7 0x7f344f66a8f4 in r_core_cmd_lines /f/radare2/radare2/libr/core/cmd.c:1989
    #8 0x7f344f66ab64 in r_core_cmd_file /f/radare2/radare2/libr/core/cmd.c:2001
    #9 0x7f344f66dba3 in r_core_run_script /f/radare2/radare2/libr/core/cmd.c:373
    #10 0x405572 in main /f/radare2/radare2/binr/radare2/radare2.c:729
    #11 0x7f3449bcef9f in __libc_start_main (/lib64/libc.so.6+0x1ff9f)
    #12 0x40a333 (/mnt/ram/radare2/radare2+0x40a333)

0x604000028a3b is located 0 bytes to the right of 43-byte region [0x604000028a10,0x604000028a3b)
allocated by thread T0 here:
    #0 0x7f344fd98855 in calloc (/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2/libasan.so.1+0x57855)
    #1 0x7f344a47bba4 in r_print_format /f/radare2/radare2/libr/util/p_format.c:1043

SUMMARY: AddressSanitizer: heap-buffer-overflow /f/radare2/radare2/libr/util/str.c:1050 r_wstr_clen
Shadow bytes around the buggy address:
  0x0c087fffd0f0: fa fa 00 00 00 00 02 fa fa fa 00 00 00 00 04 fa
  0x0c087fffd100: fa fa 00 00 00 00 04 fa fa fa fd fd fd fd fd fa
  0x0c087fffd110: fa fa fd fd fd fd fd fa fa fa 00 00 00 00 06 fa
  0x0c087fffd120: fa fa 00 00 00 00 04 fa fa fa fd fd fd fd fd fa
  0x0c087fffd130: fa fa 00 00 00 00 04 fa fa fa 00 00 00 00 04 fa
=>0x0c087fffd140: fa fa 00 00 00 00 00[03]fa fa 00 00 00 00 00 05
  0x0c087fffd150: fa fa 00 00 00 00 00 05 fa fa fa fa fa fa fa fa
  0x0c087fffd160: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c087fffd170: fa fa 00 00 00 00 04 fa fa fa 00 00 00 00 00 05
  0x0c087fffd180: fa fa fa fa fa fa fa fa fa fa 00 00 00 00 04 fa
  0x0c087fffd190: fa fa fd fd fd fd fd fd fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Contiguous container OOB:fc
  ASan internal:           fe
==9974==ABORTING