engine: filesystem: avoid FS_SysFolderExists spam if stat returned ENOTDIR

engine/common/filesystem.c

@@ -2536,6 +2536,7 @@ qboolean FS_SysFolderExists( const char *path )
 
 	if( stat( path, &buf ) < 0 )
 	{
+		if( errno != ENOTDIR )
 			Con_Reportf( S_ERROR "FS_SysFolderExists: problem while opening dir: %s\n", strerror( errno ));
 		return false;
 	}