remove oserror from rp6502

libsrc/rp6502/sysremove.c

@@ -2,16 +2,16 @@
 #include <errno.h>
 #include <string.h>
 
-unsigned char __fastcall__ _sysremove (const char* name)
+int __fastcall__ _sysremove (const char* name)
 {
     size_t namelen;
     namelen = strlen (name);
     if (namelen > 255) {
         RIA.errno_ = EINVAL;
-        return __mappederrno (RIA.errno_);
+        return -1;
     }
     while (namelen) {
         ria_push_char (name[--namelen]);
     }
-    return ria_call_int_errno (RIA_OP_UNLINK);
+    return ria_call_int (RIA_OP_UNLINK);
 }