[ELF] [PPC] Fix a typo from SVN r362721

Apparently no test covers this exact codepath, but GCC produced a
warning about it.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@362883 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/ELF/Arch/PPC.cpp b/ELF/Arch/PPC.cpp
index 57540c4..f578e0d 100644
--- a/ELF/Arch/PPC.cpp
+++ b/ELF/Arch/PPC.cpp
@@ -180,7 +180,7 @@
 
 bool PPC::inBranchRange(RelType Type, uint64_t Src, uint64_t Dst) const {
   uint64_t Offset = Dst - Src;
-  if (Type == R_PPC_REL24 || R_PPC_PLTREL24)
+  if (Type == R_PPC_REL24 || Type == R_PPC_PLTREL24)
     return isInt<26>(Offset);
   llvm_unreachable("unsupported relocation type used in branch");
 }