Separate program name from error message with a :


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40945 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-extract/llvm-extract.cpp b/tools/llvm-extract/llvm-extract.cpp
index 728c256..4a7befb 100644
--- a/tools/llvm-extract/llvm-extract.cpp
+++ b/tools/llvm-extract/llvm-extract.cpp
@@ -59,7 +59,7 @@
   
   MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename);
   if (Buffer == 0) {
-    cerr << argv[0] << "Error reading file '" + InputFilename + "'\n";
+    cerr << argv[0] << ": Error reading file '" + InputFilename + "'\n";
     return 1;
   } else {
     M.reset(ParseBitcodeFile(Buffer));