[LLDB][MIPS] Fix TestExpressionInSyscall.py for MIPS

    
    SUMMARY:
    This patch fixes TestExpressionInSyscall.py and solves bug 23659 for MIPS.
    Corrected indentation at couple of places.
    
    Reviewers: clayborg
    Subscribers: mohit.bhakkad, sagar, jaydeep, lldb-commits
    Differential Revision: http://reviews.llvm.org/D16916

llvm-svn: 260072