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patch: fix line calculation to avoid redundant searches

--- a/sys/src/cmd/patch.c

+++ b/sys/src/cmd/patch.c

@@ -527,7 +527,7 @@

 				return f->buf + off;

 			}

 		}

-		ln = h->oldln + fuzz - 1;

+		ln = h->oldln + fuzz + 1;

 		if(ln <= f->nlines){

 			off = f->lines[ln];

 			if(off + len >= f->len)