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[objdump] Validate the magic number of the object file

--- a/objdump/main.c

+++ b/objdump/main.c

@@ -189,6 +189,12 @@

 		goto wrong_file;

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

 		goto wrong_file;

+	if (strncmp(hdr.magic, MYROMAGIC, MYROMAGIC_SIZ)) {

+		fprintf(stderr,

+		        "objdump: %s: File format not recognized\n",

+		        fname);

+		goto close_file;

+	}

 	if (hdr.strsize > SIZE_MAX) {

 		fprintf(stderr,

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