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ip/tcp: remove useless nil checks for padblock() and allocb() return value

--- a/sys/src/9/ip/tcp.c

+++ b/sys/src/9/ip/tcp.c

@@ -1034,14 +1034,10 @@

 	if(data) {

 		dlen = blocklen(data);

 		data = padblock(data, hdrlen + TCP6_PKT);

-		if(data == nil)

-			return nil;

 	}

 	else {

 		dlen = 0;

 		data = allocb(hdrlen + TCP6_PKT + 64);	/* the 64 pad is to meet mintu's */

-		if(data == nil)

-			return nil;

 		data->wp += hdrlen + TCP6_PKT;

 	}