Fix uninitialized before use warning. Fix unsupported #warning directive by Tasking compiler. #2730

Job	Run time
make check (--enable-intelrdseed --enable-smallstackcache --enable-smallstack --enable-all CFLAGS...	2m 27s
make check (--enable-wolfEntropy --enable-smallstackcache --enable-smallstack --enable-all CFLAGS...	4m 11s
make check (--enable-smallstack --enable-all CFLAGS="-DWC_RNG_SEED_CB -DWOLFSSL_TRACK_MEMORY -DW...	3m 0s
make check (--enable-all CFLAGS="-DWC_RNG_SEED_CB -DWOLFSSL_TRACK_MEMORY -DWOLFSSL_DEBUG_MEMORY")	2m 53s
make check (--enable-smallstackcache --enable-smallstack --enable-all CFLAGS="-DWC_RNG_SEED_CB -...	2m 55s
make check (--enable-amdrand --enable-smallstackcache --enable-smallstack --enable-all CFLAGS="-D...	2m 58s
make check (--disable-asm --enable-wolfEntropy --enable-smallstackcache --enable-smallstack --ena...	4m 35s
	22m 59s

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