Add missing "return" statements.

ExecutionContext::GetAddressByteSize() was calling GettAddressByteSize () on Target and Process class but was ignoring the return type. I have added the missing return.
No regression in the test suite. Committed as obvious.

llvm-svn: 230502
diff --git a/lldb/source/Target/ExecutionContext.cpp b/lldb/source/Target/ExecutionContext.cpp
index 750af92..0371472 100644
--- a/lldb/source/Target/ExecutionContext.cpp
+++ b/lldb/source/Target/ExecutionContext.cpp
@@ -249,9 +249,9 @@
 ExecutionContext::GetAddressByteSize() const
 {
     if (m_target_sp && m_target_sp->GetArchitecture().IsValid())
-        m_target_sp->GetArchitecture().GetAddressByteSize();
+        return m_target_sp->GetArchitecture().GetAddressByteSize();
     if (m_process_sp)
-        m_process_sp->GetAddressByteSize();
+        return m_process_sp->GetAddressByteSize();
     return sizeof(void *);
 }