Fix bug introduced in rev 1.119: When reading in the msgbase index

(.sid file), don't divide the fread() results (it's already in number of
records read). This could cause msgbase maintenance to not take place
or corruption of a msg base.

src/sbbs3/smbutil.c

@@ -740,7 +740,6 @@ void maint(void)
 	}
 	fseek(smb.sid_fp,0L,SEEK_SET);
 	l = fread(idx, sizeof(idxrec_t), smb.status.total_msgs, smb.sid_fp);
-	l /= sizeof(idxrec_t);
 
 	printf("\nDone.\n\n");
 	printf("Scanning for pre-flagged messages...\n");