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[cc] Initialize counter to 0 in path()

--- a/src/cmd/cc/posix/cc.c

+++ b/src/cmd/cc/posix/cc.c

@@ -82,7 +82,7 @@

 	char *arg, buff[FILENAME_MAX];

 	size_t len, cnt;

-	for ( ; *s && cnt < FILENAME_MAX; ++s) {

+	for (cnt = 0 ; *s && cnt < FILENAME_MAX; ++s) {

 		if (*s != '%') {

 			buff[cnt++] = *s;

 			continue;