Return a MCSection from MCFragment::getParent().

Another step in merging MCSectionData and MCSection.

llvm-svn: 238162
diff --git a/llvm/lib/MC/MCObjectWriter.cpp b/llvm/lib/MC/MCObjectWriter.cpp
index 7a9fd49..5cc629b 100644
--- a/llvm/lib/MC/MCObjectWriter.cpp
+++ b/llvm/lib/MC/MCObjectWriter.cpp
@@ -43,7 +43,7 @@
     const MCAssembler &Asm, const MCSymbol &SymA, const MCFragment &FB,
     bool InSet, bool IsPCRel) const {
   const MCSection &SecA = SymA.getSection();
-  const MCSection &SecB = FB.getParent()->getSection();
+  const MCSection &SecB = *FB.getParent();
   // On ELF and COFF  A - B is absolute if A and B are in the same section.
   return &SecA == &SecB;
 }