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osmo_io: segmentation cb: Initialize null ptr every iteration

Change-Id: I0fcaa6afb9cf2f88243280f01c278fa2d72e69a6
(cherry picked from commit 37caff62cf4dea1a01dfd030b2d268f7d3f2215c)
---
M src/core/osmo_io.c
1 file changed, 2 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/49/39349/1

diff --git a/src/core/osmo_io.c b/src/core/osmo_io.c
index 9c93e25..cef9bec 100644
--- a/src/core/osmo_io.c
+++ b/src/core/osmo_io.c
@@ -328,7 +328,7 @@
 void iofd_handle_segmented_read(struct osmo_io_fd *iofd, struct msgb *msg, int rc)
 {
 	int res;
-	struct msgb *pending = NULL;
+	struct msgb *pending;
 
 	OSMO_ASSERT(iofd->mode == OSMO_IO_FD_MODE_READ_WRITE);
 
@@ -338,6 +338,7 @@
 	}
 
 	do {
+		pending = NULL;
 		res = iofd_handle_segmentation(iofd, msg, &pending);
 		if (res != IOFD_SEG_ACT_DEFER || rc < 0)
 			iofd->io_ops.read_cb(iofd, rc, msg);

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