Fixed warnings

PythonInterpreter/PythonTypeConversions.hh

@@ -73,7 +73,7 @@ namespace pybind11 { namespace detail {
             const char *ptr = PyUnicode_AsUTF8AndSize(source, &size);
 
             if (!ptr) {
-                return NULL;
+                return false;
             }
 
             /* Now try to convert into a C++ int */
@@ -522,7 +522,7 @@ namespace pybind11 { namespace detail {
             const char *ptr = PyUnicode_AsUTF8AndSize(source, &size);
 
             if (!ptr) {
-                return NULL;
+                return false;
             }
 
             QString updateString = QString::fromUtf8(ptr, size);
@@ -630,7 +630,7 @@ namespace pybind11 { namespace detail {
             const char *ptr = PyUnicode_AsUTF8AndSize(source, &size);
 
             if (!ptr) {
-                return NULL;
+                return false;
             }
 
             QString typeString = QString::fromUtf8(ptr, size);