sgsn_vty: Fix uninitialized variable in the gprs_apn2str method

This is fixing a GCC and Coverity warning:

GCC:
sgsn_vty.c: In function ‘vty_dump_pdp’:
sgsn_vty.c:64:5: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized]
sgsn_vty.c:49:15: note: ‘i’ was declared here

Coverity: CID 1040706
1 file changed
tree: d34e21d63429829d2273d362fddb60dd9923c321
  1. debian/
  2. hlrsync/
  3. linux-kernel/
  4. openbsc/
  5. wireshark/
  6. README