cleanup: [smap] drop bogus section("data") from extern decls

main.c declared _exp_smap and _exp_smapmodu as extern with
__attribute__((section("data"))). Same pattern fixed in the previous
commit for errno: a bare "data" section name (no leading dot) does not
match the IRX linker script and ends up as an orphan that the IRX
loader does not allocate.

In this case the annotation was always harmless because the matching
DECLARE_EXPORT_TABLE in iop/kernel/include/irx.h places the actual
definition in .text via a section(".text\\n\\t#") asm trick. Section
attributes on extern declarations are hints only; the symbol's address
is governed by the definition. The smap.irx layout is unchanged: the
linked output still has _exp_smap at .text (verified with nm), and
srxfixup no longer warns.

The cleanup just removes the misleading attribute and inline comment
so the latent bug can't manifest if the export table macro or its
placement is ever refactored.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: fjtrujy

iop/network/smap/src/main.c

@@ -270,12 +270,17 @@ void PS2IPLinkStateDown(void)
 #endif
 
 #if defined(BUILDING_SMAP_NETMAN) || defined(BUILDING_SMAP_NETDEV)
-// While the header of the export table is small, the large size of the export table (as a whole) places it in data instead of sdata.
-extern struct irx_export_table _exp_smap __attribute__((section("data")));
+/* DECLARE_EXPORT_TABLE in iop/kernel/include/irx.h places the export
+   table in .text via a section(".text\n\t#") asm trick, so the extern
+   declaration needs no section attribute. (The previous section("data")
+   was misleading: a bare "data" name produces an orphan ELF section the
+   IRX loader does not allocate; harmless here only because the actual
+   definition lives in .text.) */
+extern struct irx_export_table _exp_smap;
 #endif
 
 #ifdef BUILDING_SMAP_MODULAR
-extern struct irx_export_table _exp_smapmodu __attribute__((section("data")));
+extern struct irx_export_table _exp_smapmodu;
 #endif
 
 int _start(int argc, char *argv[])