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libmach: set errstr if we can't find a SP for a PC

this makes acid errors when you jump off the deep end
a bit less confusing.

--- a/sys/src/libmach/8db.c

+++ b/sys/src/libmach/8db.c

@@ -127,6 +127,8 @@

 		if(++i > 1000)

 			break;

 	}

+	if(i == 0)

+		werrstr("no SP for PC %#llux", pc);

 	return i;

 }

--- a/sys/src/libmach/machdata.c

+++ b/sys/src/libmach/machdata.c

@@ -359,6 +359,8 @@

 		if(++i > 40)

 			break;

 	}

+	if(i == 0)

+		werrstr("no SP for PC %#llux", pc);

 	return i;

 }

@@ -395,6 +397,8 @@

 		if(++i > 40)

 			break;

 	}

+	if(i == 0)

+		werrstr("no SP for PC %#llux", pc);

 	return i;

 }

-- 

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