don't emit warnings, pass CI

Author: scivision

+stdlib/+fileio/create_symlink.m

@@ -13,7 +13,6 @@
 % the above should work, but Matlab Java doesn't recognize the optional argument omitted.
 
 if stdlib.fileio.exists(link)
-  warning("link %s already exists", link)
   ok = false;
   return
 end

+stdlib/+fileio/read_symlink.m

@@ -8,13 +8,7 @@
 import java.nio.file.Files
 
 r = stdlib.fileio.absolute_path(p);
-if ~stdlib.fileio.exists(r)
-  warning("%s does not exist", r)
-  r = string.empty;
-  return
-end
-if ~stdlib.fileio.is_symlink(r)
-  warning("%s is not a symlink", r)
+if ~stdlib.fileio.exists(r) || ~stdlib.fileio.is_symlink(r)
   r = string.empty;
   return
 end

+stdlib/+fileio/windows_shortname.m

@@ -16,18 +16,15 @@
 short = "";
 
 if ~ispc
-  warning('Only available on Windows')
   return
 end
 
 fso = actxserver('Scripting.FileSystemObject');
 
 if isfolder(p)
-    short = fso.GetFolder(p).ShortPath;
+  short = fso.GetFolder(p).ShortPath;
 elseif isfile(p)
-    short = fso.GetFile(p).ShortPath;
-else
-    warning('%s is not folder or file', p);
+  short = fso.GetFile(p).ShortPath;
 end
 
 short = string(short);