Most of this function checks to see if m_process is non-null before
dereferencing it, except for this one section of code.  Add a null
check around it.
clang static analyzer fix.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@219920 91177308-0d34-0410-b5e6-96231b3b80d8