Remove use of builtin comma operator.

Cleanup for upcoming Clang warning -Wcomma.  No functionality change intended.

llvm-svn: 261271
diff --git a/clang/lib/Basic/SourceManager.cpp b/clang/lib/Basic/SourceManager.cpp
index 416031d..92f473a 100644
--- a/clang/lib/Basic/SourceManager.cpp
+++ b/clang/lib/Basic/SourceManager.cpp
@@ -1258,15 +1258,19 @@
 
     if (Buf[0] == '\n' || Buf[0] == '\r') {
       // If this is \n\r or \r\n, skip both characters.
-      if ((Buf[1] == '\n' || Buf[1] == '\r') && Buf[0] != Buf[1])
-        ++Offs, ++Buf;
-      ++Offs, ++Buf;
+      if ((Buf[1] == '\n' || Buf[1] == '\r') && Buf[0] != Buf[1]) {
+        ++Offs;
+        ++Buf;
+      }
+      ++Offs;
+      ++Buf;
       LineOffsets.push_back(Offs);
     } else {
       // Otherwise, this is a null.  If end of file, exit.
       if (Buf == End) break;
       // Otherwise, skip the null.
-      ++Offs, ++Buf;
+      ++Offs;
+      ++Buf;
     }
   }