app/testpmd: fix minor signed overflow in a constant
app/testpmd: fix minor signed overflow in a constant

The expression (192 << 24) has an undefined behavior since:
- the integer constant 192 has type int, and
- 192 x 2^24 is not representable as an int.

Suffixing 192 with U defines a behavior since:
- the integer constant 192U has type unsigned int, and
- the value of (192U << 24) is defined as
  (192 x 2^24) % (UINT_MAX + 1)

This minor bug was found using TrustInSoft Analyzer.

Signed-off-by: Julien Cretin <df52cc2c62e57ad698eea4bcc15941bce8df04c8@trust-in-soft.com>
Acked-by: Thomas Monjalon <ee2fa8b2681c737f775687e475dcbf2028a412f1@6wind.com>

mixja/dpdk,msune/dpdk,venkynv/dpdk-mirror,msune/dpdk,john-mcnamara-intel/dpdk,venkynv/dpdk-mirror,john-mcnamara-intel/dpdk,venkynv/dpdk-mirror,mixja/dpdk,tsphillips/dpdk-fork,tsphillips/dpdk-fork,msune/dpdk,mixja/dpdk,venkynv/dpdk-mirror,john-mcnamara-intel/dpdk,msune/dpdk,tsphillips/dpdk-fork,tsphillips/dpdk-fork,mixja/dpdk,john-mcnamara-intel/dpdk