Fix typos

Change-Id: Ie8054f3d484fe5d82cc5d91f159906a470fc4511
diff --git a/src/pq_alsa.c b/src/pq_alsa.c
index 3550221..50479e6 100644
--- a/src/pq_alsa.c
+++ b/src/pq_alsa.c
@@ -176,7 +176,7 @@
  *  \param pq Processing Queue to add the ALSA input to
  *  \param[in] hwdev ALSA hardware device to use
  *  \param[in] blk_len block length to be read from device
- *  \returns 0 on sucess; negative on error */
+ *  \returns 0 on success; negative on error */
 int
 osmo_gapk_pq_queue_alsa_input(struct osmo_gapk_pq *pq, const char *hwdev, unsigned int blk_len)
 {
@@ -190,7 +190,7 @@
  *  \param pq Processing Queue to add the ALSA output to
  *  \param[in] hwdev ALSA hardware device to use
  *  \param[in] blk_len block length to be written to device
- *  \returns 0 on sucess; negative on error */
+ *  \returns 0 on success; negative on error */
 int
 osmo_gapk_pq_queue_alsa_output(struct osmo_gapk_pq *pq, const char *hwdev, unsigned int blk_len)
 {
diff --git a/src/pq_file.c b/src/pq_file.c
index 22dc9cd..d496eec 100644
--- a/src/pq_file.c
+++ b/src/pq_file.c
@@ -103,7 +103,7 @@
  *  \param pq Processing Queue to add the input file to
  *  \param[in] src caller-fopen()ed input file
  *  \param[in] blk_len block length to be read from file
- *  \returns 0 on sucess; negative on error */
+ *  \returns 0 on success; negative on error */
 int
 osmo_gapk_pq_queue_file_input(struct osmo_gapk_pq *pq, FILE *src, unsigned int blk_len)
 {
@@ -117,7 +117,7 @@
  *  \param pq Processing Queue to add the output file to
  *  \param[in] dst caller-fopen()ed output file
  *  \param[in] blk_len block length to be written to file
- *  \returns 0 on sucess; negative on error */
+ *  \returns 0 on success; negative on error */
 int
 osmo_gapk_pq_queue_file_output(struct osmo_gapk_pq *pq, FILE *dst, unsigned int blk_len)
 {
diff --git a/src/pq_rtp.c b/src/pq_rtp.c
index 81eeb19..3a09ba7 100644
--- a/src/pq_rtp.c
+++ b/src/pq_rtp.c
@@ -116,7 +116,7 @@
 	payload = buf + sizeof(struct rtp_hdr) + (rtph->csrc_count << 2);
 	payload_len = rv - sizeof(struct rtp_hdr) - (rtph->csrc_count << 2);
 	if (payload_len < 0) {
-		rtp_err("non-existant RTP payload length %d\n", payload_len);
+		rtp_err("non-existent RTP payload length %d\n", payload_len);
 		return -1;
 	}