Remove excess SAL_WARNs

Each such precondition violation for that URE API function would already result
in osl_File_E_INVAL anyway.

Change-Id: I279949ae8f341e6272bb4574da712fd693461acd

sal/osl/unx/file_misc.cxx

@@ -347,10 +347,6 @@ oslFileError SAL_CALL osl_getNextDirectoryItem(oslDirectory pDirectory,
 
 oslFileError SAL_CALL osl_getDirectoryItem(rtl_uString* ustrFileURL, oslDirectoryItem* pItem)
 {
-    SAL_WARN_IF((!ustrFileURL) || (ustrFileURL->length == 0), "sal.file",
-                "Invalid file URL " << (ustrFileURL ? ("'" + OUString(ustrFileURL) + "'") : OUString("(null)")));
-    SAL_WARN_IF(!pItem, "sal.file", "pItem is null");
-
     rtl_uString* ustrSystemPath = nullptr;
     oslFileError osl_error = osl_File_E_INVAL;