Bug 1164619

Description of problem:
Execute inspect-get-icon failed on RHEL7 guest. Others okay.

How reproducible:
100%

Steps to Reproduce:
><fs> list-filesystems
/dev/sda1: xfs
/dev/rhel_dhcp-11-144/root: xfs
/dev/rhel_dhcp-11-144/swap: swap
><fs> inspect-os
/dev/rhel_dhcp-11-144/root
><fs> mount /dev/rhel_dhcp-11-144/root /
><fs> df
Filesystem                          1K-blocks    Used Available Use% Mounted on
tmpfs                                   97876     120     97756   1% /run
/dev                                   242296       0    242296   0% /dev
/dev/mapper/rhel_dhcp--11--144-root   7022592 3996264   3026328  57% /sysroot
><fs> trace 1
><fs> inspect-get-icon /dev/rhel_dhcp-11-144/root
libguestfs: trace: inspect_get_icon "/dev/rhel_dhcp-11-144/root"
libguestfs: trace: is_file "/etc/favicon.png" "followsymlinks:true"
libguestfs: trace: is_file = 1
libguestfs: trace: file "/etc/favicon.png"
libguestfs: trace: file = "symbolic link"
libguestfs: trace: is_file "/usr/share/pixmaps/redhat/shadowman-transparent.png" "followsymlinks:true"
libguestfs: trace: is_file = 0
libguestfs: trace: inspect_get_icon = ""


Actual results:
Failed.

Expected results:
Should pass.

Additional info:
inspect-get-icon get file /etc/favicon.png and /usr/share/pixmaps/redhat/shadowman-transparent.png from the guest as the icon of the guest operating system, but in rhel7 there is no /usr/share/pixmaps/redhat/shadowman-transparent.png, so from the trace you can see:
libguestfs: trace: is_file "/usr/share/pixmaps/redhat/shadowman-transparent.png" "followsymlinks:true"
libguestfs: trace: is_file = 0

due to this guestfish failed to get the icon. But when ' /usr/share/pixmaps/redhat/shadowman-transparent.png' is not available it should choose /etc/favicon.png as the icon. (See 'help inspect-get-icon')

Also you can display the icon by this way:
# yum install -y ImageMagick

In guestfish:
><fs> inspect-get-icon /dev/VolGroup/lv_root | display -