icon-theme: Fix leaks on error

icon-theme: Fix leaks on error

13 bytes in 1 blocks are definitely lost in loss record 766 of 16,875
   at 0x4C2DB9D: malloc (vg_replace_malloc.c:299)
   by 0xA9D0247: vasprintf (in /usr/lib64/libc-2.24.so)
   by 0xA2453FC: g_vasprintf (gprintf.c:316)
   by 0xA2152F7: g_strdup_vprintf (gstrfuncs.c:514)
   by 0xA21539C: g_strdup_printf (gstrfuncs.c:540)
   by 0x678F25C: gdk_rgba_to_string (gdkrgba.c:360)
   by 0x5FAE00D: rgba_to_string_noalpha (gtkicontheme.c:4322)
   by 0x5FAE6F2: gtk_icon_info_load_symbolic_svg (gtkicontheme.c:4492)
   by 0x5FAED4F: gtk_icon_info_load_symbolic_internal (gtkicontheme.c:4622)
   by 0x5FAEEE8: gtk_icon_info_load_symbolic (gtkicontheme.c:4711)
   by 0x5F00246: gtk_css_image_recolor_load (gtkcssimagerecolor.c:118)
   by 0x5F003E4: gtk_css_image_recolor_compute (gtkcssimagerecolor.c:170)

14 bytes in 1 blocks are definitely lost in loss record 801 of 16,875
   at 0x4C2DB9D: malloc (vg_replace_malloc.c:299)
   by 0xA9D0247: vasprintf (in /usr/lib64/libc-2.24.so)
   by 0xA2453FC: g_vasprintf (gprintf.c:316)
   by 0xA2152F7: g_strdup_vprintf (gstrfuncs.c:514)
   by 0xA21539C: g_strdup_printf (gstrfuncs.c:540)
   by 0x678F25C: gdk_rgba_to_string (gdkrgba.c:360)
   by 0x5FAE00D: rgba_to_string_noalpha (gtkicontheme.c:4322)
   by 0x5FAE68E: gtk_icon_info_load_symbolic_svg (gtkicontheme.c:4482)
   by 0x5FAED4F: gtk_icon_info_load_symbolic_internal (gtkicontheme.c:4622)
   by 0x5FAEEE8: gtk_icon_info_load_symbolic (gtkicontheme.c:4711)
   by 0x5F00246: gtk_css_image_recolor_load (gtkcssimagerecolor.c:118)
   by 0x5F003E4: gtk_css_image_recolor_compute (gtkcssimagerecolor.c:170)

15 bytes in 1 blocks are definitely lost in loss record 838 of 16,875
   at 0x4C2DB9D: malloc (vg_replace_malloc.c:299)
   by 0xA9D0247: vasprintf (in /usr/lib64/libc-2.24.so)
   by 0xA2453FC: g_vasprintf (gprintf.c:316)
   by 0xA2152F7: g_strdup_vprintf (gstrfuncs.c:514)
   by 0xA21539C: g_strdup_printf (gstrfuncs.c:540)
   by 0x678F25C: gdk_rgba_to_string (gdkrgba.c:360)
   by 0x5FAE00D: rgba_to_string_noalpha (gtkicontheme.c:4322)
   by 0x5FAE6C3: gtk_icon_info_load_symbolic_svg (gtkicontheme.c:4487)
   by 0x5FAED4F: gtk_icon_info_load_symbolic_internal (gtkicontheme.c:4622)
   by 0x5FAEEE8: gtk_icon_info_load_symbolic (gtkicontheme.c:4711)
   by 0x5F00246: gtk_css_image_recolor_load (gtkcssimagerecolor.c:118)
   by 0x5F003E4: gtk_css_image_recolor_compute (gtkcssimagerecolor.c:170)

16,384 bytes in 1 blocks are definitely lost in loss record 16,847 of 16,875
   at 0x4C2DADE: malloc (vg_replace_malloc.c:298)
   by 0x4C2FC91: realloc (vg_replace_malloc.c:785)
   by 0xA1F89FA: g_realloc (gmem.c:159)
   by 0xA1BAD2E: g_array_maybe_expand (garray.c:779)
   by 0xA1BA566: g_array_set_size (garray.c:555)
   by 0xA1BBCB8: g_byte_array_set_size (garray.c:1752)
   by 0x8D1CC48: g_file_load_contents (gfile.c:6766)
   by 0x5FAE767: gtk_icon_info_load_symbolic_svg (gtkicontheme.c:4501)
   by 0x5FAED4F: gtk_icon_info_load_symbolic_internal (gtkicontheme.c:4622)
   by 0x5FAEEE8: gtk_icon_info_load_symbolic (gtkicontheme.c:4711)
   by 0x5F00246: gtk_css_image_recolor_load (gtkcssimagerecolor.c:118)
   by 0x5F003E4: gtk_css_image_recolor_compute (gtkcssimagerecolor.c:170)

https://bugzilla.gnome.org/show_bug.cgi?id=772215