Check for null pointer before deferencing it in cmd_search.
Fixes #1462
Use dynamically allocated buffers for RSearchKeywords
Check null ptr in elf
Fix #1459 - rabin2 -g crash
Fix Warning incompatible pointer type

passing argument 2 of ‘r_file_slurp’ from incompatible pointer type [enabled by default]
Fix dpj crash (%s -> %c)
Fix Wformat