TestReadWriteLseek has off by one error

[jhnphm]

Describe the bug
TestReadWriteLseek calls strlen but fails to account for null terminator, causing garbage characters to be written to test log

To Reproduce
Build and run file-api-test
Depending on the contents of memory, bogus characters may be written to build/[arch]/default_[cpu]/Testing/Temporary/LastTest.log

Expected behavior
Valid characters in LastTest.log

Code snips
Should be size = strlen(buffer)+1

osal/src/tests/file-api-test/file-api-test.c

Line 333 in bfca5b2

size = strlen(buffer);

System observed on:
Linux

Reporter Info
John N Pham, Northrop Grumman