static packet_info* g_info in GSM dissectors

[mmann78 () netscape net]

I stumbled across the use of a packet_info* global variable (g_info) in some of the GSM dissectors.  Is this really 
necessary?  I thought it could have been just like the IEEE802.11 dissector in that it just didn't want to proliferate 
passing the packet_info structure everywhere, but I see functions that pass in a packet_info structure, but use the 
global instead (which really scared me).  It also appears like the global is used by functions called from other 
dissectors (where the function doesn't have a packet_info to pass in). 

I can take the hit and work out all of the compiler errors that result from removing the global (and proliferating the 
packet_info structure into functions), but it would it be safe to do so?

Michael

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