defect: fix code defects in public parts

defect: fix code defects in public parts

PD#166793: code defects in public parts

crypto: exclude the of_match_device function return value is NULL
ddr_tool: solve problems of bad_shift and use_after_free
debug: prevent the number of cpus from exceeding the total
efuse: solve the problem of buffer_size_warning
memory_ext: solve the problems of divide_by_zero and overrun
unifykey: solve the problem of buffer_size_warning,and add a variable
          for useless_call
wifi: exclude the of_match_node function return value is NULL,and avoid
   the problem of string_overflow

Change-Id: I099ce7c60ddd0266d067215108f0e2baeb31c234
Signed-off-by: Jianxiong Pan <jianxiong.pan@amlogic.com>