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awk: don't get into a infinite loop with eof while in string (thanks BurnZeZ)

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

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

@@ -363,7 +363,7 @@

 		case 0:

 			SYNTAX( "non-terminated string %.10s...", buf );

 			lineno++;

-			break;

+			RET(0);

 		case '\\':

 			c = input();

 			switch (c) {