Don't return NULL when the function is defined to return an integer.

OK'ed by: tjr

contrib/smbfs/lib/smb/rap.c

@@ -199,7 +199,7 @@ smb_rap_create(int fn, const char *param, const char *data,
 
 	rap = malloc(sizeof(*rap));
 	if (rap == NULL)
-		return NULL;
+		return 0;
 	bzero(rap, sizeof(*rap));
 	p = rap->r_sparam = rap->r_nparam = strdup(param);
 	rap->r_sdata = rap->r_ndata = strdup(data);