Fix typo: sterror -> strerror


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16294 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/AIX/Memory.cpp b/lib/System/AIX/Memory.cpp
index b4e9a9f..6ba57de 100644
--- a/lib/System/AIX/Memory.cpp
+++ b/lib/System/AIX/Memory.cpp
@@ -45,7 +45,7 @@
 void Memory::ReleaseRWX(Memory& M) {
   if (M.Address == 0 || M.AllocSize == 0) return;
   if (0 != munmap(M.Address, M.AllocSize)) {
-    throw std::string("Can't release RWX Memory: ") + sterror(errno);
+    throw std::string("Can't release RWX Memory: ") + strerror(errno);
   }
 }