[source] dropbear: fix procd interface trigger install

[LEDE Commits]

dedeckeh pushed a commit to source.git, branch master:
https://git.lede-project.org/e5bbead1a83944293fccc27679ba9846d133374e

commit e5bbead1a83944293fccc27679ba9846d133374e
Author: Hans Dedecker <dedeckeh at gmail.com>
AuthorDate: Wed Apr 26 16:44:02 2017 +0200

    dropbear: fix procd interface trigger install
    
    Install procd interface triggers only for interfaces which are enabled
    so dropbear instances running on (an) enabled interface(s) are not
    restarted due to an interface trigger of an interface which is disabled.
    
    Signed-off-by: Hans Dedecker <dedeckeh at gmail.com>
---
 package/network/services/dropbear/files/dropbear.init | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/package/network/services/dropbear/files/dropbear.init b/package/network/services/dropbear/files/dropbear.init
index c5210cd..3fd2c57 100755
--- a/package/network/services/dropbear/files/dropbear.init
+++ b/package/network/services/dropbear/files/dropbear.init
@@ -109,7 +109,9 @@ keygen()
 load_interfaces()
 {
 	config_get interface "$1" Interface
-	interfaces=" ${interface} ${interfaces}"
+	config_get enable "$1" enable 1
+
+	[ "${enable}" = "1" ] && interfaces=" ${interface} ${interfaces}"
 }
 
 start_service()