fabrics: rename first argument for argument macros

The first argument of the macros is the nvme_root_t variable.
build_options is using 'r' as variable name for this type, thus the
macro still worked even though the first argument was called 'o'.

Let's rename it so it matches the actual use.

Signed-off-by: Daniel Wagner <[email protected]>

Author: dwsuse

src/nvme/fabrics.c

@@ -363,7 +363,7 @@ static int __nvmf_supported_options(nvme_root_t r);
 	!__nvmf_supported_options(r) && (r)->options->tok;		\
 })
 
-#define add_bool_argument(o, argstr, tok, arg)				\
+#define add_bool_argument(r, argstr, tok, arg)				\
 ({									\
 	int ret;							\
 	if (nvmf_check_option(r, tok)) {				\
@@ -379,7 +379,7 @@ static int __nvmf_supported_options(nvme_root_t r);
 	ret;								\
 })
 
-#define add_int_argument(o, argstr, tok, arg, allow_zero) \
+#define add_int_argument(r, argstr, tok, arg, allow_zero)		\
 ({									\
 	int ret;							\
 	if (nvmf_check_option(r, tok)) {				\
@@ -396,7 +396,7 @@ static int __nvmf_supported_options(nvme_root_t r);
 	ret;								\
 })
 
-#define add_int_or_minus_one_argument(o, argstr, tok, arg)		\
+#define add_int_or_minus_one_argument(r, argstr, tok, arg)		\
 ({									\
 	int ret;							\
 	if (nvmf_check_option(r, tok)) {				\