jfs: Rename _inline to avoid conflict with clang's '-fms-extensions'

Building fs/jfs with clang and '-fms-extensions' errors with:

  In file included from fs/jfs/jfs_unicode.c:8:
  fs/jfs/jfs_incore.h:86:13: error: type name does not allow function specifier to be specified
     86 |                                         unchar _inline[128];
        |                                                ^
  fs/jfs/jfs_incore.h:86:20: error: expected member name or ';' after declaration specifiers
     86 |                                         unchar _inline[128];
        |                                         ~~~~~~~~~~~~~~^

'-fms-extensions' in clang enables several other Microsoft specific
keywords such as _inline [1], presumably for compatibility with MSVC, as
Microsoft's documentation [2] mentions:

  For compatibility with previous versions, _inline and _forceinline are
  synonyms for __inline and __forceinline, respectively

Rename the _inline array in 'struct jfs_inode_info' to _inline_sym to
avoid this conflict, which is not a large workaround as this member is
only ever referred to via the i_inline macro.

Link: https://github.com/llvm/llvm-project/blob/249883d0c5883996bed038cd82a8999f342994c9/clang/include/clang/Basic/TokenKinds.def#L744-L79 [1]
Link: https://learn.microsoft.com/en-us/cpp/c-language/inline-functions [2]
Acked-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Link: https://patch.msgid.link/20251023-jfs-fix-conflict-with-clang-ms-ext-v1-1-e219d59a1e68@kernel.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>

Author: nathanchance

fs/jfs/jfs_incore.h

@@ -76,14 +76,14 @@ struct jfs_inode_info {
 		struct {
 			unchar _unused[16];	/* 16: */
 			dxd_t _dxd;		/* 16: */
-			/* _inline may overflow into _inline_ea when needed */
+			/* _inline_sym may overflow into _inline_ea when needed */
 			/* _inline_ea may overlay the last part of
 			 * file._xtroot if maxentry = XTROOTINITSLOT
 			 */
 			union {
 				struct {
 					/* 128: inline symlink */
-					unchar _inline[128];
+					unchar _inline_sym[128];
 					/* 128: inline extended attr */
 					unchar _inline_ea[128];
 				};
@@ -101,7 +101,7 @@ struct jfs_inode_info {
 #define i_imap u.file._imap
 #define i_dirtable u.dir._table
 #define i_dtroot u.dir._dtroot
-#define i_inline u.link._inline
+#define i_inline u.link._inline_sym
 #define i_inline_ea u.link._inline_ea
 #define i_inline_all u.link._inline_all