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intf_line.c: Make e1d_find_intf_by_usb_serial safe for empty string

Avoid segfault in case the empty string is passed as serial_str.

Change-Id: Ia69912cb714441415d8decd68890d1b97b77132d
---
M src/intf_line.c
1 file changed, 3 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-e1d refs/changes/83/27583/1

diff --git a/src/intf_line.c b/src/intf_line.c
index 0ff3942..c9011a8 100644
--- a/src/intf_line.c
+++ b/src/intf_line.c
@@ -100,6 +100,9 @@
 {
 	struct e1_intf *intf;
 
+	if (!serial_str)
+		return NULL;
+
 	llist_for_each_entry(intf, &e1d->interfaces, list)
 		if (intf->usb.serial_str && !strcmp(intf->usb.serial_str, serial_str))
 			return intf;

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