Simplify ParseName

Only the first char needs to be checked with IsNameStartChar, so check
it before the loop.
diff --git a/tinyxml2.cpp b/tinyxml2.cpp
index 7b975c9..dfb6831 100755
--- a/tinyxml2.cpp
+++ b/tinyxml2.cpp
@@ -140,18 +140,18 @@
     if ( !p || !(*p) ) {

         return 0;

     }

+    if ( !XMLUtil::IsNameStartChar( *p ) ) {

+        return 0;

+    }

 

     char* const start = p;

-

-    while( *p && ( p == start ? XMLUtil::IsNameStartChar( *p ) : XMLUtil::IsNameChar( *p ) )) {

+    ++p;

+    while ( *p && XMLUtil::IsNameChar( *p ) ) {

         ++p;

     }

 

-    if ( p > start ) {

-        Set( start, p, 0 );

-        return p;

-    }

-    return 0;

+    Set( start, p, 0 );

+    return p;

 }