plugin: Fix deadlock in getSchema where mutex is never unlocked
plugin: Fix deadlock in getSchema where mutex is never unlocked

On the second call here this would fail to release the lock.

rnaveiras/terraform,brandontosch/terraform,tommynsong/terraform,nlamirault/terraform,tpounds/terraform,pdecat/terraform,youhong316/terraform,tommynsong/terraform,luis-silva/terraform,youhong316/terraform,gechr/terraform,nlamirault/terraform,iljaskevic/terraform,drebes/terraform,gechr/terraform,pryorda/terraform,ewbankkit/terraform,hashicorp/terraform,mattray/terraform,VladRassokhin/terraform,rnaveiras/terraform,apparentlymart/terraform,pdecat/terraform,youhong316/terraform,luis-silva/terraform,brandontosch/terraform,pdecat/terraform,pryorda/terraform,apparentlymart/terraform,hashicorp/terraform,heimweh/terraform,VladRassokhin/terraform,drebes/terraform,brandontosch/terraform,mattray/terraform,hashicorp/terraform,tommynsong/terraform,heimweh/terraform,mattray/terraform,mattray/terraform,pradeepbhadani/terraform,tpounds/terraform,iljaskevic/terraform,ewbankkit/terraform,iljaskevic/terraform,brandontosch/terraform,luis-silva/terraform,pradeepbhadani/terraform,gechr/terraform,luis-silva/terraform,iljaskevic/terraform,tpounds/terraform,apparentlymart/terraform,rnaveiras/terraform,VladRassokhin/terraform,pradeepbhadani/terraform,heimweh/terraform,heimweh/terraform,brandontosch/terraform,VladRassokhin/terraform,pdecat/terraform,apparentlymart/terraform,apparentlymart/terraform,tpounds/terraform,heimweh/terraform,pryorda/terraform,drebes/terraform,ewbankkit/terraform,drebes/terraform,youhong316/terraform,nlamirault/terraform,ewbankkit/terraform