The code is correct as it contains an assert(3) in the "default" switch

The code is correct as it contains an assert(3) in the "default" switch
case, but GCC 4.3 is not able to detect this and instead complains
with "warning: 'amode' may be used uninitialized in this function".
Hence, although the assert(3) already protects the code here, get rid of
this compiler warning by doing a simple initialization of the "amode"
variable. (CVS 4436)

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