MT#55283 update return type

Change-Id: Id536bea91bd34287c6c318c5edf00c4dcf017846

lib/streambuf.c

@@ -177,7 +177,7 @@ char *streambuf_getline(struct streambuf *b) {
 	return s;
 }
 
-unsigned int streambuf_bufsize(struct streambuf *b) {
+size_t streambuf_bufsize(struct streambuf *b) {
 	return b->buf->len;
 }
 

lib/streambuf.h

@@ -41,7 +41,7 @@ void streambuf_destroy(struct streambuf *);
 int streambuf_writeable(struct streambuf *);
 int streambuf_readable(struct streambuf *);
 char *streambuf_getline(struct streambuf *);
-unsigned int streambuf_bufsize(struct streambuf *);
+size_t streambuf_bufsize(struct streambuf *);
 void streambuf_printf(struct streambuf *, const char *, ...) __attribute__ ((format (printf, 2, 3)));
 void streambuf_vprintf(struct streambuf *, const char *, va_list);
 void streambuf_write(struct streambuf *, const char *, unsigned int);