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[strip] Simplify error handling

--- a/src/cmd/strip.c

+++ b/src/cmd/strip.c

@@ -32,15 +32,14 @@

 	FILE *fp, *tmp;

 	Obj *obj;

+	errno = 0;

 	filename = fname;

-	if ((tmp = fopen("strip.tmp", "wb")) == NULL) {

-		error(strerror(errno));

+

+	fp = fopen(fname, "rb");

+	tmp = tmpfile();

+	if (!fp || !tmp)

 		goto err;

-	}

-	if ((fp = fopen(fname, "rb")) == NULL) {

-		error(strerror(errno));

-		goto err1;

-	}

+

 	if ((type = objtype(fp, NULL)) < 0) {

 		error("file format not recognized");

 		goto err2;

@@ -79,6 +78,9 @@

 	fclose(tmp);

 	remove("strip.tmp");

 err:

+	if (errno)

+		error(strerror(errno));

+

 	return;

 }