Fix small memory leak.

See riscv-collab/riscv-openocd#672

Change-Id: Ia11ab9bcf860f770ea64ad867102c74b898f6b66
Signed-off-by: Tim Newsome <[email protected]>
Reviewed-on: https://review.openocd.org/c/openocd/+/6831
Tested-by: jenkins
Reviewed-by: zapb <[email protected]>
Reviewed-by: Antonio Borneo <[email protected]>

Author: timsifive

src/target/riscv/riscv-013.c

@@ -2308,9 +2308,11 @@ static int init_target(struct command_context *cmd_ctx,
 	generic_info->hart_count = &riscv013_hart_count;
 	generic_info->data_bits = &riscv013_data_bits;
 	generic_info->print_info = &riscv013_print_info;
-	generic_info->version_specific = calloc(1, sizeof(riscv013_info_t));
-	if (!generic_info->version_specific)
-		return ERROR_FAIL;
+	if (!generic_info->version_specific) {
+		generic_info->version_specific = calloc(1, sizeof(riscv013_info_t));
+		if (!generic_info->version_specific)
+			return ERROR_FAIL;
+	}
 	generic_info->sample_memory = sample_memory;
 	riscv013_info_t *info = get_info(target);