Completion of error handling

[elfring]

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

• fclose ⇒ doCompressFile
• fseek ⇒ skipNByte
• pthread_create ⇒ qzCompressCrcExt

[Yogaraj-Alamenda]

Thanks for raising the issue. We will check and fix this issues in the upcoming release

[elfring]

How do you think about to improve static source code analysis also for this software? 🤔