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[libc] Fix uninitialized counter in vfprintf

found by cppcheck

--- a/libc/src/vfprintf.c

+++ b/libc/src/vfprintf.c

@@ -34,10 +34,10 @@

 int

 vfprintf(FILE * restrict fp, const char *fmt, va_list va)

 {

-	int c, base, sign, cnt;

+	int c, base, sign, cnt = 0;

 	char *s;

-	while (( c = *fmt++) != '\0') {

+	while ((c = *fmt++) != '\0') {

 		if (c == '%') {

 			sign = 0;

 			switch (*fmt++) {