timeline: Evaluate return value properly.
timeline: Utilize lsmash_freep().
chapter: Evaluate return value properly.
chapter: Remove redundant 'if' for freeing.
fragment: Evaluate return value properly.
meta: Evaluate return value properly.
summary: Evaluate return value of lsmash_add_entry() properly.
print: Evaluate return value of print function properly.
read: Evaluate return value properly.
isom: Evaluate return value properly.
box: Remove redundant 'if's for freeing.
box: Evaluate return value properly.
chapter: Utilize lsmash_get_entry_data().