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patch: make slurp() return void

It sysfatals if it fails and has no non-success returns.

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

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

@@ -459,7 +459,7 @@

 	free(changed);

 }

-int

+void

 slurp(Fbuf *f, char *path)

 {

 	int n, i, fd, sz, len, nlines, linesz;

@@ -502,7 +502,6 @@

 	f->lines = lines;

 	f->nlines = nlines;

 	f->lastln = -1;

-	return 0;

 }

 char*

@@ -569,8 +568,8 @@

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

 		h = &p->hunk[i];

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

-			if(!dryrun && slurp(&f, h->oldpath) == -1)

-				sysfatal("slurp %s: %r", h->oldpath);

+			if(!dryrun)

+				slurp(&f, h->oldpath);

 			curfile = h->newpath;

 			e = f.buf;

 		}