module: Remove leftover '#undef' from export header

Commit 7290d580 ("module: use relative references for __ksymtab
entries") converted the '__put' #define into an assembly macro in
asm-generic/export.h but forgot to remove the corresponding '#undef'.

Remove the leftover '#undef'.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jessica Yu <jeyu@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Jessica Yu <jeyu@kernel.org>

include/asm-generic/export.h

@@ -55,7 +55,6 @@ __kcrctab_\name:
 #endif
 #endif
 .endm
-#undef __put
 
 #if defined(CONFIG_TRIM_UNUSED_KSYMS)