Add a missing 'else'.  Found by grep '} if'

No testcase because it is apparently not so trivial to construct.

llvm-svn: 170595
diff --git a/llvm/lib/CodeGen/MachineVerifier.cpp b/llvm/lib/CodeGen/MachineVerifier.cpp
index 590c20a..7241bb9 100644
--- a/llvm/lib/CodeGen/MachineVerifier.cpp
+++ b/llvm/lib/CodeGen/MachineVerifier.cpp
@@ -597,7 +597,7 @@
       ++MBBI;
       if (MBBI == MF->end()) {
         report("MBB conditionally falls through out of function!", MBB);
-      } if (MBB->succ_size() == 1) {
+      } else if (MBB->succ_size() == 1) {
         // A conditional branch with only one successor is weird, but allowed.
         if (&*MBBI != TBB)
           report("MBB exits via conditional branch/fall-through but only has "