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Add assertion to symFindMacroArg() to debug oob array access

--- a/src/asm/symbol.c

+++ b/src/asm/symbol.c

@@ -5,6 +5,7 @@

  *

  */

+#include <assert.h>

 #include <stdio.h>

 #include <string.h>

 #include <time.h>

@@ -431,6 +432,8 @@

 	if (i == -1)

 		i = MAXMACROARGS + 1;

+	assert(i-1 >= 0 &&

+	    i-1 < sizeof(currentmacroargs)/sizeof(*currentmacroargs));

 	return (currentmacroargs[i - 1]);

 }