Add src/node/* code to node:: namespace

src/node/psbt.cpp

@@ -12,6 +12,7 @@
 
 #include <numeric>
 
+namespace node {
 PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx)
 {
     // Go through each input and build status
@@ -147,3 +148,4 @@ PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx)
 
     return result;
 }
+} // namespace node