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patch: add missing case in previous change

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

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

@@ -723,6 +723,8 @@

 			sysfatal("open stdin: %r");

 		if((p = parse(f, "stdin")) == nil)

 			sysfatal("parse patch: %r");

+		if(workdir != nil && chdir(workdir) == -1)

+			sysfatal("chdir %s: %r", workdir);

 		if(apply(p, "stdin") == -1){

 			fprint(2, "apply stdin: %r\n");

 			ok = 0;

-- 

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