Fix another segfault in 1998/schnitzi

The program would also crash if the arg had any character that's not a
digit or if the arg had only 0s in it (it would work if it had 0
followed by a digit other than 0). In other words if it is converted to
0 it would segfault.

The bugs.md file has been updated as well to note what's also now in the
README.md file: even a relatively small number can cause a substantial
amount of lines of output. For instance the number 9 causes 771999 lines
(!!) of output.

1998/schnitzi/README.md

@@ -28,9 +28,17 @@
 	echo 324 >> data
 	./sort < data
 
-[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed two segfaults in
+[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed three segfaults in
 this entry. The first was caused by invalid data types. The second was triggered
-if one did not specify any arg. Thank you Cody for your assistance!
+if one did not specify any arg. The third happened if the arg was had any
+characters that were not the digits 1 - 9 (if it started with 0 it could work as
+long as another digit followed it and there were no other non-digits). Thank you
+Cody for your assistance!
+
+NOTE: the larger the number the number of lines of output can become
+substantially higher as well. Doing `./schnitzi 9` will actually print 771999
+lines!
+
 
 ## Judges' comments
 

1998/schnitzi/schnitzi.c

@@ -52,5 +52,6 @@ void x_(){ O=g; *r=y[k-2]; _=r; j=o_; }
 void d (){ O=g; *r=y[k]; _=r; k=k+1; m=k<z; w=_t; l=p_; j=p; }
 void y_(){ O=g; *r=x[17][1]+k; _=r; j=q_; }
 void r_(){ O=_b; _=x[17]; s=(char**)_d; s=s+1; i=*s; q=0; }
-main(int v,char **V){ if (V[1]) {O=r_; _d=V;
-  x: (O)(); goto x; }}
+main(int v,char **V){ if (V[1]) {if(atoi(V[1])!=0) {
+ q=0; O=r_; _d=V;
+  x: (O)(); goto x; }}}

bugs.md

@@ -93,7 +93,8 @@ formatting code.
 ## STATUS: INABIAF - please **DO NOT** fix
 ### INABIAF: It's not a bug it's a feature :-)
 
-Entries with this status should NOT be touched: they are system specific by design
+Entries with this status should NOT be touched (unless they have another status
+that suggests that issue can be changed): they are system specific by design
 or are other things that are not actually bugs even if they appear to be but are
 noteworthy nonetheless.
 
@@ -516,6 +517,15 @@ Please DO NOT change this either.
 If there are any other warnings triggered by your compiler please DO NOT fix
 those either!
 
+Another important note is that as the number passed into the program gets bigger
+the number of lines of output gets substantially larger. For instance:
+
+```sh
+$ ./schnitzi 9|wc -l
+  771999
+```
+
+
 # 1999
 
 There was no IOCCC in 1999.