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[objdump] Delay print name

Don't print anything until be sure it is a valid object.

--- a/objdump/main.c

+++ b/objdump/main.c

@@ -209,7 +209,6 @@

 	FILE *fp;

 	struct myrohdr hdr;

-	puts(fname);

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

 		goto wrong_file;

 	if (rdmyrohdr(fp, &hdr) < 0)

@@ -220,6 +219,7 @@

 		        fname);

 		goto close_file;

 	}

+	puts(fname);

 	if (hdr.strsize > SIZE_MAX) {

 		fprintf(stderr,

 			"objdump: %s: overflow in header\n",