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patch: fix line bounds check when searching for hunk

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

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

@@ -517,7 +517,7 @@

 	for(fuzz = 0; scanning && fuzz <= nfuzz; fuzz++){

 		scanning = 0;

 		ln = h->oldln - fuzz;

-		if(ln > f->lastln){

+		if(ln > f->lastln && ln < f->nlines){

 			off = f->lines[ln];

 			if(off + len > f->len)

 				continue;

@@ -528,7 +528,7 @@

 			}

 		}

 		ln = h->oldln + fuzz + 1;

-		if(ln <= f->nlines){

+		if(ln > f->lastln && ln < f->nlines){

 			off = f->lines[ln];

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

 				continue;