unsigned -> size_t for string::find returns

stepmania/src/FontCharAliases.cpp

@@ -319,7 +319,7 @@ void ReplaceText( CString &Text, const map<CString,CString> &m )
 		size_t start = 0;
 		while(1)
 		{
-			unsigned pos = txt.find(it->first, start);
+			size_t pos = txt.find(it->first, start);
 			if(pos == txt.npos)
 				break;
 

stepmania/src/NotesLoaderBMS.cpp

@@ -516,7 +516,7 @@ bool BMSLoader::LoadFromDir( CString sDir, Song &out )
 		if( value_name == "#title" )
 		{
 			// strip Steps type out of description leaving only song title - looks like 'B4U <BASIC>'
-			unsigned iIndex = value_data.find_last_of('<');
+			size_t iIndex = value_data.find_last_of('<');
 			if( iIndex == value_data.npos )
 				iIndex = value_data.find_last_of('(');
 			if( iIndex != value_data.npos )

stepmania/src/NotesLoaderDWI.cpp

@@ -484,14 +484,14 @@ bool DWILoader::LoadFromDWIFile( CString sPath, Song &out )
 			 * to pick up images used here as song images (eg. banners). */
 			CString param = sParams[1];
 			/* "{foo} ... {foo2}" */
-			unsigned pos = 0;
+			size_t pos = 0;
 			while( pos < CString::npos )
 			{
 
-				unsigned startpos = param.find('{', pos);
+				size_t startpos = param.find('{', pos);
 				if( startpos == CString::npos )
 					break;
-				unsigned endpos = param.find('}', startpos);
+				size_t endpos = param.find('}', startpos);
 				if( endpos == CString::npos )
 					break;
 

stepmania/src/ScreenTestSound.cpp

@@ -60,7 +60,7 @@ void ScreenTestSound::UpdateText(int n)
 {
 
 	CString fn = s[n].s.GetLoadedFilePath();
-	unsigned x = fn.find_last_of("/\\");
+	size_t x = fn.find_last_of("/\\");
 	if(x != fn.npos) fn.erase(0, x+1);
 
 	vector<RageSound *> snds;

stepmania/src/TitleSubstitution.cpp

@@ -143,7 +143,7 @@ void TitleSubst::Load(const CString &filename, const CString &section)
 			continue;
 		}
 
-		unsigned pos = line.find_first_of(':');
+		size_t pos = line.find_first_of(':');
 		if(pos != string::npos)
 		{
 			/* x: y */

stepmania/src/archutils/Win32/RegistryAccess.cpp

@@ -7,7 +7,7 @@
  * the HKEY_LOCAL_MACHINE constant in key. */
 static bool GetRegKeyType( const CString &in, CString &out, HKEY &key )
 {
-	unsigned backslash = in.find( '\\' );
+	size_t backslash = in.find( '\\' );
 	if( backslash == in.npos )
 	{
 		LOG->Warn( "Invalid registry key: \"%s\" ", in.c_str() );