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libmp: check nil return value of strtomp() in test program

--- a/sys/src/libmp/test.c

+++ b/sys/src/libmp/test.c

@@ -40,7 +40,8 @@

 	for(i=0; i<nelem(base); i++){

 		p = mptoa(b, base[i], nil, 0);

 		print("base%d: %s = ", base[i], p);

-		strtomp(p, nil, base[i], b);

+		if(strtomp(p, nil, base[i], b) == nil)

+			abort();

 		free(p);

 		print("%B\n", b, base[i], b);

@@ -51,7 +52,8 @@

 		case 16:

 			p = smprint("%#.*B", base[i], b);

 			print("# %s = ", p);

-			strtomp(p, nil, 0, b);

+			if(strtomp(p, nil, 0, b) == nil)

+				abort();

 			free(p);

 			print("%#.*B\n", base[i], b);

 			break;