Let's hope that three time's a charm...

Tim discovered another "bug" in my get_line() code: while the comments
said that n<0 was invalid, it was in fact still called with n<0 (when
PyFile_GetLine() was called with n<0).  In that case fortunately
executed the same code as for n==0.

Changed the comment to admit this fact, and changed Tim's MS speed
hack code to use 'n <= 0' as the criteria for the speed hack.

Objects/fileobject.c

@@ -804,8 +804,7 @@ ms_getline_hack(FILE *fp)
 /* Internal routine to get a line.
    Size argument interpretation:
    > 0: max length;
-   = 0: read arbitrary line;
-   < 0: invalid
+   <= 0: read arbitrary line
 */
 
 #ifdef HAVE_GETC_UNLOCKED
@@ -828,7 +827,8 @@ get_line(PyFileObject *f, int n)
 	PyObject *v;
 
 #ifdef USE_MS_GETLINE_HACK
-	if (n == 0)
+	
+	if (n <= 0)
 		return ms_getline_hack(fp);
 #endif
 	n2 = n > 0 ? n : 100;