[cppcheck] found a few errors in example code

[ettlmartin]

during a check with the static code analysis tool ​cppcheck
the tool found a few resource leaks and one memory leak

Here the output of the tool

example/sftp_RW_nonblock.c:287: (Error) Resource leak: tempstorage
example/x11.c:129: (Error) Memory leak: temp_buff
example/scp_write.c:201: (Error) Resource leak: local
example/sftp_write.c:203: (Error) Resource leak: local

Please refer the attached patch that fixes the issues

Best regards

Ettl Martin

[ettlmartin]

proper fix

[stuge]

Fixed in commit 2149244cfe21a612e2d2f7b568a29b8eb1b96a5d