Fix HOST_PRINTF format string

[nmeum]

Without this patch the printf invocation takes more argument that it has format strings, since the format_qos() output string is printed in the if statement following the HOST_PRINTF invocation, I believe this to be an accidental error made in 66464b61f8ee756dcfc0081944f4367da2b1a6ab (this commit removes the format from the format string but doesn't remove the argument).

[xtaran]

This also affects liboping in Debian, but there are actually more such issues than this pull request fixes. The remaining issues are:

oping.c: In function ‘update_graph_prettyping’:
oping.c:1159:25: error: format not a string literal and no format arguments [-Werror=format-security]
 1159 |                         mvwprintw (ctx->window, /* y = */ y_max, /* x = */ x + 2, symbol);
      |                         ^~~~~~~~~
oping.c: In function ‘update_graph_histogram’:
oping.c:1265:41: error: format not a string literal and no format arguments [-Werror=format-security]
 1265 |                                         hist_symbols_utf8[index]);
      |                                         ^~~~~~~~~~~~~~~~~
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Werror -g -O2 -ffile-prefix-map=/home/abe/debian/NMU/liboping=. -fstack-protector-strong -Wformat -Werror=format-security -c liboping.c -o liboping_la-liboping.o >/dev/null 2>&1
cc1: all warnings being treated as errors

[bzed]

https://salsa.debian.org/debian/liboping/-/blob/debian/debian/patches/fix_HOST_PRINTF_format_string.patch should fix all issues, you might want to use that instead of the PR.