fix trivial typos; NFC

sucessor -> successor 

llvm-svn: 307488
diff --git a/llvm/lib/Transforms/Scalar/StructurizeCFG.cpp b/llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
index 486f3e5..0cccb41 100644
--- a/llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
+++ b/llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
@@ -329,7 +329,7 @@
       Loops[Exit] = N->getEntry();
 
   } else {
-    // Test for sucessors as back edge
+    // Test for successors as back edge
     BasicBlock *BB = N->getNodeAs<BasicBlock>();
     BranchInst *Term = cast<BranchInst>(BB->getTerminator());