Fix typo in comments.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@165105 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Driver.cpp b/lib/Driver/Driver.cpp
index 918bc97..254c419 100644
--- a/lib/Driver/Driver.cpp
+++ b/lib/Driver/Driver.cpp
@@ -1581,7 +1581,7 @@
 
 std::string Driver::GetFilePath(const char *Name, const ToolChain &TC) const {
   // Respect a limited subset of the '-Bprefix' functionality in GCC by
-  // attempting to use this prefix when lokup up program paths.
+  // attempting to use this prefix when lookup up program paths.
   for (Driver::prefix_list::const_iterator it = PrefixDirs.begin(),
        ie = PrefixDirs.end(); it != ie; ++it) {
     std::string Dir(*it);