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cc1: Allocate atleast one item for an arglist

This fixes a regression from commit 02f0aed96a08450b8f69e89fb784483e9e6af864 .

--- a/src/cmd/cc/cc1/cpp.c

+++ b/src/cmd/cc/cc1/cpp.c

@@ -160,7 +160,7 @@

 		next();

 	} else {

 		do {

-			mp->arglist = xrealloc(mp->arglist, n*sizeof(char *));

+			mp->arglist = xrealloc(mp->arglist, (n+1)*sizeof(char *));

 			mp->arglist[n] = parameter(mp);

 		} while (++n < NR_MACROARG && yytoken == ',');

 	}