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diff: clean up some comments

I did the tidying and fixes. Let's remove those
comments.

--- a/sys/src/cmd/diff/diffio.c

+++ b/sys/src/cmd/diff/diffio.c

@@ -141,8 +141,8 @@

 		p = erealloc(p, (++j+3)*sizeof(Line));

 	len[i] = j;

 	file[i] = p;

-	input[i] = bp;			/*fix*/

-	if (i == 0) {			/*fix*/

+	input[i] = bp;

+	if (i == 0) {

 		file1 = orig;

 		firstchange = 0;

 	} else

--- a/sys/src/cmd/diff/diffreg.c

+++ b/sys/src/cmd/diff/diffreg.c

@@ -89,7 +89,6 @@

 int *J;		/*will be overlaid on class*/

 long *ixold;	/*will be overlaid on klist*/

 long *ixnew;	/*will be overlaid on file[1]*/

-/* END OF SOME TIDYING */

 static void	

 sort(Line *a, int n)	/*shellsort CACM #201*/

-- 

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