bssgp: Fix bssgp_tx_fc_bvc parameter type

Currently large values for Bmax default MS get sliced since a uint16_t is
used as the type of the corresponding parameter of bssgp_tx_fc_bvc.
GSM 48.018, 11.3.2 which in turn refers to 11.3.5 specifies a maximum
of 6MB (0xffff * 100).

This commit changes the type to uint32_t to cover the full value
range.

Sponsored-by: On-Waves ehf
diff --git a/src/gb/gprs_bssgp_bss.c b/src/gb/gprs_bssgp_bss.c
index 5731959..962bf2e 100644
--- a/src/gb/gprs_bssgp_bss.c
+++ b/src/gb/gprs_bssgp_bss.c
@@ -315,7 +315,7 @@
  */
 int bssgp_tx_fc_bvc(struct bssgp_bvc_ctx *bctx, uint8_t tag,
 		    uint32_t bucket_size, uint32_t bucket_leak_rate,
-		    uint16_t bmax_default_ms, uint32_t r_default_ms,
+		    uint32_t bmax_default_ms, uint32_t r_default_ms,
 		    uint8_t *bucket_full_ratio, uint32_t *queue_delay_ms)
 {
 	struct msgb *msg;