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patch: fix uninitialized Fbuf during dry run

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

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

@@ -568,10 +568,11 @@

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

 		h = &p->hunk[i];

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

-			if(!dryrun)

+			if(!dryrun){

 				slurp(&f, h->oldpath);

+				e = f.buf;

+			}

 			curfile = h->newpath;

-			e = f.buf;

 		}

 		if(!dryrun){

 			s = e;

@@ -581,7 +582,8 @@

 			e += h->oldlen;

 		}

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

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

+			if(!dryrun)

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

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

 			osz = 0;

 		}