Fix build warning in jerry-ext/arg on tizenrt-artik05x
Fix build warning in jerry-ext/arg on tizenrt-artik05x

tizenrt-arttik05x treats warning as error for uninitialized use.
This patch fixes the error in jerry-ext/arg by initializing to zero.

JerryScript-DCO-1.0-Signed-off-by: Sanggyu Lee sg5.lee@samsung.com

LaszloLango/jerryscript,yichoi/jerryscript,robertsipka/jerryscript,robertsipka/jerryscript,zherczeg/jerryscript,zherczeg/jerryscript,LaszloLango/jerryscript,robertsipka/jerryscript,yichoi/jerryscript,bsdelf/jerryscript,jack60504/jerryscript,glistening/jerryscript,bsdelf/jerryscript,bsdelf/jerryscript,LaszloLango/jerryscript,grgustaf/jerryscript,dbatyai/jerryscript,gabrielschulhof/jerryscript,dbatyai/jerryscript,jerryscript-project/jerryscript,jerryscript-project/jerryscript,akosthekiss/jerryscript,dbatyai/jerryscript,bsdelf/jerryscript,LaszloLango/jerryscript,yichoi/jerryscript,bzsolt/jerryscript,akosthekiss/jerryscript,zherczeg/jerryscript,gabrielschulhof/jerryscript,glistening/jerryscript,grgustaf/jerryscript,bzsolt/jerryscript,akosthekiss/jerryscript,jack60504/jerryscript,robertsipka/jerryscript,bzsolt/jerryscript,yichoi/jerryscript,robertsipka/jerryscript,jerryscript-project/jerryscript,robertsipka/jerryscript,LaszloLango/jerryscript,glistening/jerryscript,grgustaf/jerryscript,dbatyai/jerryscript,jack60504/jerryscript,bzsolt/jerryscript,zherczeg/jerryscript,jack60504/jerryscript,jack60504/jerryscript,jerryscript-project/jerryscript,bsdelf/jerryscript,gabrielschulhof/jerryscript,grgustaf/jerryscript,grgustaf/jerryscript,jack60504/jerryscript,gabrielschulhof/jerryscript,gabrielschulhof/jerryscript,yichoi/jerryscript,glistening/jerryscript,bsdelf/jerryscript,dbatyai/jerryscript,jerryscript-project/jerryscript,grgustaf/jerryscript,glistening/jerryscript,zherczeg/jerryscript,glistening/jerryscript,akosthekiss/jerryscript,bzsolt/jerryscript,akosthekiss/jerryscript