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sed: allow whitespace after ! negation (thanks k0ga)

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

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

@@ -308,10 +308,10 @@

 			} else

 				rep->ad2.type = A_NONE;

 		}

+swit:

 		while(*cp == L' ' || *cp == L'\t')

 			cp++;

-swit:

 		switch(*cp++) {

 		default:

 			quit("Unrecognized command: %S", linebuf);