Completion of error handling

[elfring]

Would you like to add more error handling for return values from functions like the following?

• fputs ⇒ file_emit
• malloc ⇒ vrb_mutex_allocate
• pthread_mutex_lock ⇒ mutex_enter

[elfring]

:crystal_ball: How will chances evolve to benefit any more also from the means of aspect-oriented software development?