x86emu: re-align breaks in ins() and outs()

Makes the 4-byte cases match those for 1- & 2-byte handling,
moving the break from being unconditionally hit the first time
through the to loop to after the loop is done.

Fixes Solaris Studio compiler warnings:
"prim_ops.c", line 2626: warning: end-of-loop code not reached
"prim_ops.c", line 2692: warning: end-of-loop code not reached

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
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