Warn if there is no newline at the end of the group file.

PR:		51256
Submitted by:	Brian D Gallaway <bdg730@makserver0.usask.ca>
Reviewed by:	tjr, -audit
Approved by:	tjr

usr.sbin/chkgrp/chkgrp.c

@@ -74,6 +74,10 @@ main(int argc, char *argv[])
     while (++n) {
 	if ((line = fgetln(gf, &len)) == NULL)
 	    break;
+	if (len > 0 && line[len - 1] != '\n') {
+	    warnx("%s: line %d: no newline character", gfn, n);
+	    e++;
+	}
 	while (len && isspace(line[len-1]))
 	    len--;