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patch: fix deletion of files

If we are deleting a file, we do not want to attempt to create an
empty /dev/null.tmp$pid.

finish() doesn't look at tmp for deletions during a successful run, so
leave it set to nil. On a failure, guard tmp removal on tmp != nil.

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

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

@@ -393,12 +393,11 @@

 	char *tmp;

 	int fd;

-	if(strcmp(new, "/dev/null") == 0 && len != 0){

-		sysfatal("diff modifies removed file");

-		return;

-	}

 	tmp = nil;

-	if(!dryrun){

+	if(strcmp(new, "/dev/null") == 0){

+		if(len != 0)

+			sysfatal("diff modifies removed file");

+	}else if(!dryrun){

 		if(mkpath(new) == -1)

 			sysfatal("mkpath %s: %r", new);

 		if((tmp = smprint("%s.tmp%d", new, getpid())) == nil)

@@ -428,7 +427,7 @@

 	for(i = 0; i < nchanged; i++){

 		c = &changed[i];

 		if(!ok){

-			if(remove(c->tmp) == -1)

+			if(c->tmp != nil && remove(c->tmp) == -1)

 				fprint(2, "remove %s: %r\n", c->tmp);

 			goto Free;

 		}