binfmt_som.c: add MODULE_LICENSE

Add the missing MODULE_LICENSE("GPL").

Reported-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/binfmt_som.c

@@ -306,3 +306,5 @@ static void __exit exit_som_binfmt(void)
 
 core_initcall(init_som_binfmt);
 module_exit(exit_som_binfmt);
+
+MODULE_LICENSE("GPL");