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libmp: handle out of memory case in gmfield()

--- a/sys/src/libmp/port/gmfield.c

+++ b/sys/src/libmp/port/gmfield.c

@@ -96,6 +96,9 @@

 	M = mpcopy(N);

 	C = malloc(sizeof(int)*(d+1));

 	X = malloc(sizeof(int)*(d*d));

+	if(C == nil || X == nil)

+		goto out;

+

 	for(i=0; i<=d; i++){

 		if((M->p[i]>>8) != 0 && (~M->p[i]>>8) != 0)

 			goto out;