userspace/libsinsp/event: remove some whitespace
userspace/libsinsp/event: remove a warning and a possible integer overflow

spos is unsigned and thus it cannot be negative.
m_paramstr_storage.size() - spos could produce a integer overflow when
spos is greater than size.
userspace/libscap/scap_savefile: bytestowrite is unsigned
Merge pull request #131 from ret2libc/master

Some fix for signed/unsigned warnings