[committed, testcase] cleanup gnu11 for gcc.target/arm/lp1243022.c

[Jiong Wang]

one more gnu11 fix for gcc.target/arm/lp1243022.c
(this test only run on arm-none-eabi/-mthumb, just noticed when I go through bare metal test)

committed as obvious, 217230.

gcc/testsuite/
   * gcc.target/arm/lp1243022.c (xhci_test_trb_in_td): Add return type.
   (xhci_check_trb_in_td_math): Likewise.
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