Fix typo.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12953 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/TargetData.cpp b/lib/Target/TargetData.cpp
index 78d5d2e..4b69f10 100644
--- a/lib/Target/TargetData.cpp
+++ b/lib/Target/TargetData.cpp
@@ -82,7 +82,7 @@
                        unsigned char ByteAl) {
 
   // If this assert triggers, a pass "required" TargetData information, but the
-  // top level tool did not provide once for it.  We do not want to default
+  // top level tool did not provide one for it.  We do not want to default
   // construct, or else we might end up using a bad endianness or pointer size!
   //
   assert(!TargetName.empty() &&