ikrt_readdir bugs

[Derick Eddington]

ikrt_readdir added in r1763 has some bugs:

gcc -DHAVE_CONFIG_H -I. -I.. -I../../src -g -O2 -DNDEBUG -O3 -Wall -MT ikarus-io.o -MD -MP -MF .deps/ikarus-io.Tpo -c -o ikarus-io.o ../../src/ikarus-io.c
../../src/ikarus-io.c: In function ‘ikrt_readdir’:
../../src/ikarus-io.c:398: error: ‘struct dirent’ has no member named ‘d_namlen’

The d_namlen field is not POSIX and my Ubuntu doesn't have it.

The return from the C readdir function needs to be checked for error.

Attached is a patch to fix these.

[Abdulaziz Ghuloum (aghuloum)]

Applied patch in rev 1764. Thanks Derick.