Use xrealloc instead of realloc

Change places that use realloc, without a proper error path, to instead use
xrealloc. Drop an erroneous error path in the daemon code that used errno
in the die message in favour of the simpler xrealloc.

Signed-off-by: Jonas Fonseca <fonseca@diku.dk>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff-delta.c

@@ -392,7 +392,7 @@ create_delta(const struct delta_index *index,
 				outsize = max_size + MAX_OP_SIZE + 1;
 			if (max_size && outpos > max_size)
 				break;
-			out = realloc(out, outsize);
+			out = xrealloc(out, outsize);
 			if (!out) {
 				free(tmp);
 				return NULL;