mtd-utils: clean up compile warnings

mtd-utils: clean up compile warnings

gcc 4.4.3 on x86_64:

libcrc32.c:42: warning: ‘static’ is not at beginning of declaration

libfec.c:120: warning: initialization discards qualifiers from pointer target type
libfec.c:121: warning: initialization discards qualifiers from pointer target type

libfec.c:417: warning: passing argument 2 of ‘my_malloc’ discards qualifiers from pointer target type

recv_image.c:164: warning: comparison of unsigned expression < 0 is always false
recv_image.c:170: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘size_t’
recv_image.c:170: warning: format ‘%d’ expects type ‘int’, but argument 4 has type ‘long unsigned int’

And many more along the same lines.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>