util/nvmutil: remove unnecessary check

we can just use errval as argument to set_err,
because set_err itself now properly handles
errno, ensuring that is is never set to zero.

Signed-off-by: Leah Rowe <leah@libreboot.org>

util/nvmutil/nvmutil.c

@@ -603,7 +603,7 @@ err(int errval, const char *msg, ...)
 	vfprintf(stderr, msg, args);
 	va_end(args);
 
-	set_err(errval ? errval : ECANCELED);
+	set_err(errval);
 	fprintf(stderr, ": %s", strerror(errno));
 
 	fprintf(stderr, "\n");