[BusyBox] remove type for RESERVE_BB_BUFFER defines

[Glenn McGrath]

Currently the reserve buffers defines only has type char and unsigned
char.

#ifdef BB_FEATURE_BUFFERS_GO_ON_STACK
#define RESERVE_BB_BUFFER(buffer,len)           char buffer[len]
#define RESERVE_BB_UBUFFER(buffer,len) unsigned char buffer[len]
#else
#define RESERVE_BB_BUFFER(buffer,len)           char
*buffer=xmalloc(len)
#define RESERVE_BB_UBUFFER(buffer,len) unsigned char
*buffer=xmalloc(len)
#endif


If we took out the type we could make it 
#ifdef BB_FEATURE_BUFFERS_GO_ON_STACK
#define RESERVE_BB_BUFFER(buffer,len)	char buffer[len]
#else
#define RESERVE_BB_BUFFER(buffer,len)	*buffer=xmalloc(len)
#endif

Then if we want to define an array of unsigned chars we could do.

RESERVE_BB_BUFFER((unsigned char) buffer,len);

Or if we want to define an array of unsigned long long we could do

RESERVE_BB_BUFFER((unsigned long long) buffer, len * sizeof(unsigned
long long));

I cant see how the current setup could be used to define an array on
non-chars without doing a cast in a seperate statement.

Do these changes make sense ?


Glenn