qdl: report error when malloc fails in decode_programmer_archive

Every other error path in this function calls ux_err() before jumping
to the err label. Add the missing message for the malloc failure case.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: orbisai0security

src/qdl.c

@@ -252,8 +252,10 @@ static int decode_programmer_archive(struct sahara_image *blob, struct sahara_im
 			images[id].name = strdup(tok);
 		images[id].len = filesize;
 		images[id].ptr = malloc(filesize);
-		if (!images[id].ptr)
+		if (!images[id].ptr) {
+			ux_err("failed to allocate memory for programmer archive entry\n");
 			goto err;
+		}
 		memcpy(images[id].ptr, ptr, filesize);
 
 		ptr += filesize;