Fix 2 memory leaks:

==9617== 42 bytes in 1 blocks are definitely lost in loss record 3,654 of 7,443
==9617==    at 0x4C2FB45: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==9617==    by 0x1A4A81: slurm_xmalloc (xmalloc.c:84)
==9617==    by 0x1A505C: makespace (xstring.c:102)
==9617==    by 0x1A51A6: _xstrcat (xstring.c:133)
==9617==    by 0x1A58B6: _xstrfmtcat (xstring.c:292)
==9617==    by 0x3181D7: parse_resv_nodecnt (state_control.c:213)
==9617==    by 0x17611A: _set_resv_msg (resv_info.c:352)
==9617==    by 0x17650A: _admin_focus_out_resv (resv_info.c:472)

==9617== 136 bytes in 1 blocks are definitely lost in loss record 6,082 of 7,443
==9617==    at 0x4C2DB2F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==9617==    by 0x63FF80F: __vasprintf_chk (vasprintf_chk.c:80)
==9617==    by 0x5C3E0D8: g_vasprintf (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.5200.0)
==9617==    by 0x5C18BAC: g_strdup_vprintf (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.5200.0)
==9617==    by 0x5C18C68: g_strdup_printf (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.5200.0)
==9617==    by 0x175F7A: _set_resv_msg (resv_info.c:306)
==9617==    by 0x17650A: _admin_focus_out_resv (resv_info.c:472)
==9617==    by 0x4F6B92B: ??? (in /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0.2400.31)

Bug 2329.