engine: common: mark AbortCurrentFrame as NORETURN, fix noreturn warnings

engine/common/common.h

@@ -691,7 +691,7 @@ int EXPORT Host_Main( int argc, char **argv, const char *progname, int bChangeGa
 int Host_CompareFileTime( int ft1, int ft2 );
 void Host_NewInstance( const char *name, const char *finalmsg );
 void Host_EndGame( qboolean abort, const char *message, ... ) _format( 2 );
-void Host_AbortCurrentFrame( void );
+void Host_AbortCurrentFrame( void ) NORETURN;
 void Host_WriteServerConfig( const char *name );
 void Host_WriteOpenGLConfig( void );
 void Host_WriteVideoConfig( void );

engine/common/host.c

@@ -721,7 +721,6 @@ void GAME_EXPORT Host_Error( const char *error, ... )
 	else if( host.framecount == host.errorframe )
 	{
 		Sys_Error( "Host_MultiError: %s", hosterror2 );
-		return;
 	}
 	else
 	{
@@ -741,7 +740,6 @@ void GAME_EXPORT Host_Error( const char *error, ... )
 	{
 		Con_Printf( "Host_RecursiveError: %s", hosterror2 );
 		Sys_Error( "%s", hosterror1 );
-		return; // don't multiple executes
 	}
 
 	recursive = true;