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awk: no need to call getargv() twice to get the value for FILENAME

--- a/sys/src/cmd/awk/lib.c

+++ b/sys/src/cmd/awk/lib.c

@@ -88,7 +88,7 @@

 	for (i = 1; i < *AARGC; i++) {

 		if (!isclvar(p = getargv(i))) {	/* find 1st real filename */

-			setsval(lookup("FILENAME", symtab), getargv(i));

+			setsval(lookup("FILENAME", symtab), p);

 			return;

 		}

 		setclvar(p);	/* a commandline assignment before filename */

-- 

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