Fix a bug preventing the cause for a module file-not-found from being displayed

llvm-svn: 280010
diff --git a/clang/test/Modules/explicit-build.cpp b/clang/test/Modules/explicit-build.cpp
index df9c346..16eb604 100644
--- a/clang/test/Modules/explicit-build.cpp
+++ b/clang/test/Modules/explicit-build.cpp
@@ -167,7 +167,7 @@
 // RUN:            -fmodule-file=%t/nonexistent.pcm \
 // RUN:            %s 2>&1 | FileCheck --check-prefix=CHECK-NO-FILE %s
 //
-// CHECK-NO-FILE: fatal error: module file '{{.*}}nonexistent.pcm' not found
+// CHECK-NO-FILE: fatal error: module file '{{.*}}nonexistent.pcm' not found: module file not found
 
 // RUN: mv %t/a.pcm %t/a-tmp.pcm
 // RUN: not %clang_cc1 -x c++ -std=c++11 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t -Rmodule-build -fno-modules-error-recovery \