lmb: add a check to prevent memory overrun

When printing the LMB flags for a memory region, there is a need to
check that the array index that is computed is a sane value. Put a
noisy assert in case this check fails, as that implies something with
the LMB code is not working as expected.

Reported-by: Coverity (CID 510463)
Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>

lib/lmb.c

@@ -76,6 +76,7 @@ static void lmb_print_region_flags(enum lmb_flags flags)
 
 	do {
 		bitpos = flags ? fls(flags) - 1 : 0;
+		assert_noisy(bitpos < ARRAY_SIZE(flag_str));
 		printf("%s", flag_str[bitpos]);
 		flags &= ~(1ull << bitpos);
 		puts(flags ? ", " : "\n");