DAOS-14805 dfuse: Correctly propagate errors in ioil. (daos-stack#13515)

Fix an issue where all errors would be mapped to 1 (EPERM)

Signed-off-by: Ashley Pittman <[email protected]>

src/client/dfuse/il/int_posix.c

@@ -2180,7 +2180,7 @@ dfuse_fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
 		if (nread != nmemb)
 			entry->fd_eof = true;
 	} else if (bytes_read < 0) {
-		entry->fd_err = bytes_read;
+		entry->fd_err = errcode;
 	} else {
 		entry->fd_eof = true;
 	}
@@ -2239,7 +2239,7 @@ dfuse_fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
 		nwrite        = bytes_written / size;
 		entry->fd_pos = oldpos + (nwrite * size);
 	} else if (bytes_written < 0) {
-		entry->fd_err = bytes_written;
+		entry->fd_err = errcode;
 	}
 
 	vector_decref(&fd_table, entry);