Define patch_ssrc as bool type

This variable clearly holds a boolean value, so let's use stdef to make
it clear.

Change-Id: I05233a413b0d8511d056e8f93467a111c4bdf119
diff --git a/include/osmocom/mgcp/mgcp_network.h b/include/osmocom/mgcp/mgcp_network.h
index 1766f4a..0487b91 100644
--- a/include/osmocom/mgcp/mgcp_network.h
+++ b/include/osmocom/mgcp/mgcp_network.h
@@ -34,7 +34,7 @@
 
 	struct {
 		/* are we patching the SSRC value? */
-		int patch_ssrc;
+		bool patch_ssrc;
 		/* original SSRC (to which we shall patch any different SSRC) */
 		uint32_t orig_ssrc;
 		/* offset to apply on the sequence number */
diff --git a/src/libosmo-mgcp/mgcp_network.c b/src/libosmo-mgcp/mgcp_network.c
index 1014bf2..cac8ef0 100644
--- a/src/libosmo-mgcp/mgcp_network.c
+++ b/src/libosmo-mgcp/mgcp_network.c
@@ -636,7 +636,7 @@
 			adjust_rtp_timestamp_offset(endp, state, rtp_end, addr,
 						    delta_seq, timestamp);
 
-			state->patch.patch_ssrc = 1;
+			state->patch.patch_ssrc = true;
 			ssrc = state->patch.orig_ssrc;
 			if (rtp_end->force_constant_ssrc != -1)
 				rtp_end->force_constant_ssrc -= 1;