oss/nm256_audio: fix init text section reference:

Error: ./sound/oss/nm256_audio.o .text refers to 0000000000001847 R_X86_64_PC32     .init.text+0x0000000000000018
Signed-off-by: Randy Dunlap <rddunlap@osdl.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>