staging: r8188eu: remove function _rtw_vmalloc

Remove the function _rtw_vmalloc from os_dep/osdep_service.c, converting
its only user (also in os_dep/osdep_service.c) to use plain vmalloc.
This function is just an inline wrapper around vmalloc which returns a u8
pointer, which isn't needed. Also remove the declaration from
include/osdep_service.h.

It is considered generally bad practice to declare functions as inline in
the majority of cases, as not only can this qualifier be ignored by the
compiler but the compiler generally makes good decisions about inlining
anyway.
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20210818234853.208448-4-phil@philpotter.co.ukSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/include/osdep_service.h

@@ -171,7 +171,6 @@ extern unsigned char WPA_TKIP_CIPHER[4];
 extern unsigned char RSN_TKIP_CIPHER[4];
 
 #define rtw_update_mem_stat(flag, sz) do {} while (0)
-u8 *_rtw_vmalloc(u32 sz);
 u8 *_rtw_zvmalloc(u32 sz);
 #define rtw_zvmalloc(sz)			_rtw_zvmalloc((sz))
 

drivers/staging/r8188eu/os_dep/osdep_service.c

@@ -36,17 +36,10 @@ u32 rtw_atoi(u8 *s)
 	return num;
 }
 
-inline u8 *_rtw_vmalloc(u32 sz)
-{
-	u8	*pbuf;
-	pbuf = vmalloc(sz);
-	return pbuf;
-}
-
 inline u8 *_rtw_zvmalloc(u32 sz)
 {
 	u8	*pbuf;
-	pbuf = _rtw_vmalloc(sz);
+	pbuf = vmalloc(sz);
 	if (pbuf)
 		memset(pbuf, 0, sz);
 	return pbuf;