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patch: fix consecutive deletions

Consecutive delete hunks will both have newpath of /dev/null, but we
need to reslurp oldpath between these hunks.

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

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

@@ -556,9 +556,9 @@

 int

 apply(Patch *p, char *fname)

 {

-	char *o, *s, *e, *curfile;

+	char *o, *s, *e, *curfile, *nextfile;

 	int i, osz;

-	Hunk *h;

+	Hunk *h, *prevh;

 	Fbuf f;

 	e = nil;

@@ -565,14 +565,26 @@

 	o = nil;

 	osz = 0;

 	curfile = nil;

+	h = nil;

+	prevh = nil;

 	for(i = 0; i < p->nhunk; i++){

 		h = &p->hunk[i];

-		if(curfile == nil || strcmp(curfile, h->newpath) != 0){

+		if(strcmp(h->newpath, "/dev/null") == 0)

+			nextfile = h->oldpath;

+		else

+			nextfile = h->newpath;

+		if(curfile == nil || strcmp(curfile, nextfile) != 0){

+			if(curfile != nil){

+				if(!dryrun)

+					o = append(o, &osz, e, f.buf + f.len);

+				blat(prevh->oldpath, prevh->newpath, o, osz);

+				osz = 0;

+			}

 			if(!dryrun){

 				slurp(&f, h->oldpath);

 				e = f.buf;

 			}

-			curfile = h->newpath;

+			curfile = nextfile;

 		}

 		if(!dryrun){

 			s = e;

@@ -581,12 +593,12 @@

 			o = append(o, &osz, h->new, h->new + h->newlen);

 			e += h->oldlen;

 		}

-		if(i+1 == p->nhunk || strcmp(curfile, p->hunk[i+1].newpath) != 0){

-			if(!dryrun)

-				o = append(o, &osz, e, f.buf + f.len);

-			blat(h->oldpath, h->newpath, o, osz);

-			osz = 0;

-		}

+		prevh = h;

+	}

+	if(curfile != nil){

+		if(!dryrun)

+			o = append(o, &osz, e, f.buf + f.len);

+		blat(h->oldpath, h->newpath, o, osz);

 	}

 	free(o);

 	return 0;