Use "__asm __volatile" rather than "__asm" for instruction sequences

that modify condition codes (the carry bit, in this case). Without
"__volatile", the compiler might add the inline assembler instructions
between unrelated code which also uses condition codes, modifying the
latter.
This prevents the TCP pseudo header checksum calculation done in
tcp_output() from having effects on other conditions when compiled
with GCC 4.2.1 at "-O2" and "options INET6" left out. [1]

Reported & tested by:	Boris Kochergin [1]
MFC after:		3 days

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