Fix various warnings.  NFC

llvm-svn: 296717
diff --git a/lldb/source/Utility/VASprintf.cpp b/lldb/source/Utility/VASprintf.cpp
index fc89e3c..c3006dd 100644
--- a/lldb/source/Utility/VASprintf.cpp
+++ b/lldb/source/Utility/VASprintf.cpp
@@ -31,7 +31,7 @@
     goto finish;
   }
 
-  if (length >= buf.size()) {
+  if (size_t(length) >= buf.size()) {
     // The error formatted string didn't fit into our buffer, resize it
     // to the exact needed size, and retry
     buf.resize(length + 1);
@@ -41,7 +41,7 @@
       result = false;
       goto finish;
     }
-    assert(length < buf.size());
+    assert(size_t(length) < buf.size());
   }
   buf.resize(length);