fixes suggested by cppcheck: check realloc result to avoid memory leak...

fixes suggested by cppcheck: check realloc result to avoid memory leak (memleakOnRealloc), Fix printf() signednsess (invalidPrintfArgType_sint)


git-svn-id: https://svn.code.sf.net/p/smartmontools/code/trunk@4156 4ea69e1a-61f1-4043-bf83-b5c94c648137