remove unnecessary null checks from christen_monst

Closes #681

doc/fixes3-7-0.txt

@@ -1537,7 +1537,8 @@ function savelev() in save.c was dereferencing a NHFILE pointer for
 function tin_details() in eat.c was passing an obj pointer to
 	tin_variety() where it was dereferenced; move the tin_details()
 	NULL check above that tin_variety() call (pr #676 by argrath)
-
+remove unnecessary null checks from christen_orc() (pr #681 by argrath)
+ 
 
 Code Cleanup and Reorganization
 -------------------------------

src/do_name.c

@@ -2415,7 +2415,7 @@ christen_orc(struct monst *mtmp, const char *gang, const char *other)
     char buf[BUFSZ], buf2[BUFSZ], *orcname;
 
     orcname = rndorcname(buf2);
-    /* orcname is never NULL */
+    /* rndorcname() won't return NULL */
     sz = (int) strlen(orcname);
     if (gang)
         sz += (int) (strlen(gang) + sizeof " of " - sizeof "");