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size: Remove spureous strerror() output

Readobj() returns error in cases where errno is not set,
so using strerror() can generate strange messages.

--- a/src/cmd/size.c

+++ b/src/cmd/size.c

@@ -47,12 +47,12 @@

 	Section sec;

 	if ((obj = newobj(type)) == NULL) {

-		error(strerror(errno));

+		error("failed allocation");

 		return;

 	}

 	if (readobj(obj, fp) < 0) {

-		error(strerror(errno));

+		error("invalid file");

 		goto err;

 	}